Skip to main content
Top
Published in: BMC Musculoskeletal Disorders 1/2013

Open Access 01-12-2013 | Research article

Development of the young spine questionnaire

Authors: Henrik Hein Lauridsen, Lise Hestbaek

Published in: BMC Musculoskeletal Disorders | Issue 1/2013

Login to get access

Abstract

Background

Back pain in children is common and early onset of back pain has been shown to increase the risk of back pain significantly in adulthood. Consequently, preventive efforts must be targeted the young population but research relating to spinal problems in this age group is scarce. Focus has primarily been on the working age population, and therefore specific questionnaires to measure spinal pain and its consequences, specifically aimed at children and adolescents are absent. The purpose of this study was to develop a questionnaire for schoolchildren filling this gap.

Methods

The Young Spine Questionnaire (YSQ) was developed in three phases – a conceptualisation, development and testing phase. The conceptualisation phase followed the Wilson and Cleary model and included questions regarding spinal prevalence estimates, pain frequency and intensity, activity restrictions, care seeking behaviour and influence of parental back trouble. Items from existing questionnaires and the “Revised Faces Pain Scale” (rFPS) were included during the development phase. The testing phase consisted of a mixed quantitative and qualitative iterative method carried out in two pilot tests using 4th grade children and focusing on assessment of spinal area location and item validity.

Results

The testing phase resulted in omission of the pain drawings and the questions and answer categories were simplified in several questions. Agreement between the questionnaire prevalence estimates and the interviews ranged between 83.7% (cervical pain today) and 97.9% (thoracic pain today). To improve the understanding of the spinal boundaries we added bony landmarks to the spinal drawings after pilot test I. This resulted in an improved sense of spinal boundary location in pilot test II. Correlations between the rFPS and the interview pain score ranged between 0.67 (cervical spine) and 0.79 (lumbar spine).

Conclusions

The Young Spine Questionnaire contains questions that assess spinal pain and its consequences. The items have been tested for content understanding and agreement between questionnaire scores and interview findings among target respondents. These preliminary results suggest that the YSQ is feasible, has content validity and is a well understood questionnaire to be used in studies of children aged 9 to 11 years.
Appendix
Available only for authorised users
Literature
1.
go back to reference Grotle M, Brox JI, Vollestad NK: Functional Status and Disability Questionnaires: What Do They Assess?: A Systematic Review of Back-Specific Outcome Questionnaires. Spine. 2005, 30 (1): 130-140.CrossRefPubMed Grotle M, Brox JI, Vollestad NK: Functional Status and Disability Questionnaires: What Do They Assess?: A Systematic Review of Back-Specific Outcome Questionnaires. Spine. 2005, 30 (1): 130-140.CrossRefPubMed
2.
go back to reference Deyo RA, Battie M, Beurskens AJ, Bombardier C, Croft P, Koes B, Malmivaara A, Roland M, Von Korff M, Waddell G: Outcome measures for low back pain research. A proposal for standardized use. Spine. 1998, 23 (18): 2003-2013. 10.1097/00007632-199809150-00018.CrossRefPubMed Deyo RA, Battie M, Beurskens AJ, Bombardier C, Croft P, Koes B, Malmivaara A, Roland M, Von Korff M, Waddell G: Outcome measures for low back pain research. A proposal for standardized use. Spine. 1998, 23 (18): 2003-2013. 10.1097/00007632-199809150-00018.CrossRefPubMed
3.
go back to reference Dworkin RH, Turk DC, Farrar JT, Haythornthwaite JA, Jensen MP, Katz NP, Kerns RD, Stucki G, Allen RR, Bellamy N: Core outcome measures for chronic pain clinical trials: IMMPACT recommendations. Pain. 2005, 113 (1–2): 9-19.CrossRefPubMed Dworkin RH, Turk DC, Farrar JT, Haythornthwaite JA, Jensen MP, Katz NP, Kerns RD, Stucki G, Allen RR, Bellamy N: Core outcome measures for chronic pain clinical trials: IMMPACT recommendations. Pain. 2005, 113 (1–2): 9-19.CrossRefPubMed
4.
go back to reference Duggleby T, Kumar S: Epidemiology of juvenile low back pain: a review. Disabil Rehabil. 1997, 19 (12): 505-512. 10.3109/09638289709166043.CrossRefPubMed Duggleby T, Kumar S: Epidemiology of juvenile low back pain: a review. Disabil Rehabil. 1997, 19 (12): 505-512. 10.3109/09638289709166043.CrossRefPubMed
5.
go back to reference Jeffries LJ, Milanese SF, Grimmer-Somers KA: Epidemiology of adolescent spinal pain: a systematic overview of the research literature. Spine (Phila Pa 1976). 2007, 32 (23): 2630-2637. 10.1097/BRS.0b013e318158d70b.CrossRef Jeffries LJ, Milanese SF, Grimmer-Somers KA: Epidemiology of adolescent spinal pain: a systematic overview of the research literature. Spine (Phila Pa 1976). 2007, 32 (23): 2630-2637. 10.1097/BRS.0b013e318158d70b.CrossRef
6.
go back to reference Leboeuf-Yde C, Kyvik KO: At what age does low back pain become a common problem? A study of 29,424 individuals aged 12-41 years. Spine (Phila Pa 1976). 1998, 23 (2): 228-234. 10.1097/00007632-199801150-00015.CrossRef Leboeuf-Yde C, Kyvik KO: At what age does low back pain become a common problem? A study of 29,424 individuals aged 12-41 years. Spine (Phila Pa 1976). 1998, 23 (2): 228-234. 10.1097/00007632-199801150-00015.CrossRef
7.
go back to reference Taimela S, Kujala UM, Salminen JJ, Viljanen T: The prevalence of low back pain among children and adolescents. A nationwide, cohort-based questionnaire survey in Finland. Spine (Phila Pa 1976). 1997, 22 (10): 1132-1136. 10.1097/00007632-199705150-00013.CrossRef Taimela S, Kujala UM, Salminen JJ, Viljanen T: The prevalence of low back pain among children and adolescents. A nationwide, cohort-based questionnaire survey in Finland. Spine (Phila Pa 1976). 1997, 22 (10): 1132-1136. 10.1097/00007632-199705150-00013.CrossRef
8.
go back to reference Perquin CW, Hazebroek-Kampschreur AA, Hunfeld JA, Bohnen AM, van Suijlekom-Smit LW, Passchier J, van der Wouden JC: Pain in children and adolescents: a common experience. Pain. 2000, 87 (1): 51-58. 10.1016/S0304-3959(00)00269-4.CrossRefPubMed Perquin CW, Hazebroek-Kampschreur AA, Hunfeld JA, Bohnen AM, van Suijlekom-Smit LW, Passchier J, van der Wouden JC: Pain in children and adolescents: a common experience. Pain. 2000, 87 (1): 51-58. 10.1016/S0304-3959(00)00269-4.CrossRefPubMed
9.
go back to reference Burton AK, Clarke RD, McClune TD, Tillotson KM: The natural history of low back pain in adolescents. Spine (Phila Pa 1976). 1996, 21 (20): 2323-2328. 10.1097/00007632-199610150-00004.CrossRef Burton AK, Clarke RD, McClune TD, Tillotson KM: The natural history of low back pain in adolescents. Spine (Phila Pa 1976). 1996, 21 (20): 2323-2328. 10.1097/00007632-199610150-00004.CrossRef
10.
go back to reference Wedderkopp N, Leboeuf-Yde C, Andersen LB, Froberg K, Hansen HS: Back pain reporting pattern in a Danish population-based sample of children and adolescents. Spine. 2001, 26 (17): 1879-1883. 10.1097/00007632-200109010-00012.CrossRefPubMed Wedderkopp N, Leboeuf-Yde C, Andersen LB, Froberg K, Hansen HS: Back pain reporting pattern in a Danish population-based sample of children and adolescents. Spine. 2001, 26 (17): 1879-1883. 10.1097/00007632-200109010-00012.CrossRefPubMed
11.
go back to reference Balague F, Nordin M, Skovron ML, Dutoit G, Yee A, Waldburger M: Non-specific low-back pain among schoolchildren: a field survey with analysis of some associated factors. J Spinal Disord. 1994, 7 (5): 374-379.PubMed Balague F, Nordin M, Skovron ML, Dutoit G, Yee A, Waldburger M: Non-specific low-back pain among schoolchildren: a field survey with analysis of some associated factors. J Spinal Disord. 1994, 7 (5): 374-379.PubMed
12.
go back to reference Roth-Isigkeit A, Thyen U, Stoven H, Schwarzenberger J, Schmucker P: Pain among children and adolescents: restrictions in daily living and triggering factors. Pediatrics. 2005, 115 (2): e152-e162. 10.1542/peds.2004-0682.CrossRefPubMed Roth-Isigkeit A, Thyen U, Stoven H, Schwarzenberger J, Schmucker P: Pain among children and adolescents: restrictions in daily living and triggering factors. Pediatrics. 2005, 115 (2): e152-e162. 10.1542/peds.2004-0682.CrossRefPubMed
13.
go back to reference Brattberg G: The incidence of back pain and headache among Swedish school children. Qual Life Res. 1994, 3 (Suppl 1): S27-S31.CrossRefPubMed Brattberg G: The incidence of back pain and headache among Swedish school children. Qual Life Res. 1994, 3 (Suppl 1): S27-S31.CrossRefPubMed
14.
go back to reference Stull DE, Leidy NK, Parasuraman B, Chassany O: Optimal recall periods for patient-reported outcomes: challenges and potential solutions. Curr Med Res Opin. 2009, 25 (4): 929-942. 10.1185/03007990902774765.CrossRefPubMed Stull DE, Leidy NK, Parasuraman B, Chassany O: Optimal recall periods for patient-reported outcomes: challenges and potential solutions. Curr Med Res Opin. 2009, 25 (4): 929-942. 10.1185/03007990902774765.CrossRefPubMed
15.
go back to reference Carey TS, Garrett J, Jackman A, Sanders L, Kalsbeek W: Reporting of acute low back pain in a telephone interview. Identification of potential biases. Spine (Phila Pa 1976). 1995, 20 (7): 787-790. 10.1097/00007632-199504000-00009.CrossRef Carey TS, Garrett J, Jackman A, Sanders L, Kalsbeek W: Reporting of acute low back pain in a telephone interview. Identification of potential biases. Spine (Phila Pa 1976). 1995, 20 (7): 787-790. 10.1097/00007632-199504000-00009.CrossRef
16.
go back to reference Volinn E: The epidemiology of low back pain in the rest of the world. A review of surveys in low- and middle-income countries. Spine (Phila Pa 1976). 1997, 22 (15): 1747-1754. 10.1097/00007632-199708010-00013.CrossRef Volinn E: The epidemiology of low back pain in the rest of the world. A review of surveys in low- and middle-income countries. Spine (Phila Pa 1976). 1997, 22 (15): 1747-1754. 10.1097/00007632-199708010-00013.CrossRef
17.
go back to reference Hestbaek L, Leboeuf-Yde C, Kyvik KO, Manniche C: The course of low back pain from adolescence to adulthood: eight-year follow-up of 9600 twins. Spine (Phila Pa 1976). 2006, 31 (4): 468-472. 10.1097/01.brs.0000199958.04073.d9.CrossRef Hestbaek L, Leboeuf-Yde C, Kyvik KO, Manniche C: The course of low back pain from adolescence to adulthood: eight-year follow-up of 9600 twins. Spine (Phila Pa 1976). 2006, 31 (4): 468-472. 10.1097/01.brs.0000199958.04073.d9.CrossRef
18.
go back to reference Harreby M, Nygaard B, Jessen T, Larsen E, Storr-Paulsen A, Lindahl A, Fisker I, Laegaard E: Risk factors for low back pain in a cohort of 1389 Danish school children: an epidemiologic study. Eur Spine J. 1999, 8 (6): 444-450. 10.1007/s005860050203.CrossRefPubMedPubMedCentral Harreby M, Nygaard B, Jessen T, Larsen E, Storr-Paulsen A, Lindahl A, Fisker I, Laegaard E: Risk factors for low back pain in a cohort of 1389 Danish school children: an epidemiologic study. Eur Spine J. 1999, 8 (6): 444-450. 10.1007/s005860050203.CrossRefPubMedPubMedCentral
19.
go back to reference Siivola SM, Levoska S, Latvala K, Hoskio E, Vanharanta H, Keinanen-Kiukaanniemi S: Predictive factors for neck and shoulder pain: a longitudinal study in young adults. Spine (Phila Pa 1976). 2004, 29 (15): 1662-1669. 10.1097/01.BRS.0000133644.29390.43.CrossRef Siivola SM, Levoska S, Latvala K, Hoskio E, Vanharanta H, Keinanen-Kiukaanniemi S: Predictive factors for neck and shoulder pain: a longitudinal study in young adults. Spine (Phila Pa 1976). 2004, 29 (15): 1662-1669. 10.1097/01.BRS.0000133644.29390.43.CrossRef
21.
go back to reference Wilson IB, Cleary PD: Linking clinical variables with health-related quality of life. A conceptual model of patient outcomes. JAMA. 1995, 273 (1): 59-65. 10.1001/jama.1995.03520250075037.CrossRefPubMed Wilson IB, Cleary PD: Linking clinical variables with health-related quality of life. A conceptual model of patient outcomes. JAMA. 1995, 273 (1): 59-65. 10.1001/jama.1995.03520250075037.CrossRefPubMed
22.
go back to reference Kuorinka I, Jonsson B, Kilbom A, Vinterberg H, Biering-Sorensen F, Andersson G, Jorgensen K: Standardised Nordic questionnaires for the analysis of musculoskeletal symptoms. Appl Ergon. 1987, 18 (3): 233-237. 10.1016/0003-6870(87)90010-X.CrossRefPubMed Kuorinka I, Jonsson B, Kilbom A, Vinterberg H, Biering-Sorensen F, Andersson G, Jorgensen K: Standardised Nordic questionnaires for the analysis of musculoskeletal symptoms. Appl Ergon. 1987, 18 (3): 233-237. 10.1016/0003-6870(87)90010-X.CrossRefPubMed
23.
go back to reference Hicks CL, von Baeyer CL, Spafford PA, van Korlaar I, Goodenough B: The Faces Pain Scale-Revised: toward a common metric in pediatric pain measurement. Pain. 2001, 93 (2): 173-183. 10.1016/S0304-3959(01)00314-1.CrossRefPubMed Hicks CL, von Baeyer CL, Spafford PA, van Korlaar I, Goodenough B: The Faces Pain Scale-Revised: toward a common metric in pediatric pain measurement. Pain. 2001, 93 (2): 173-183. 10.1016/S0304-3959(01)00314-1.CrossRefPubMed
24.
go back to reference Kjaer P, Leboeuf-Yde C, Sorensen JS, Bendix T: An epidemiologic study of MRI and low back pain in 13-year-old children. Spine. 2005, 30 (7): 798-806. 10.1097/01.brs.0000157424.72598.ec.CrossRefPubMed Kjaer P, Leboeuf-Yde C, Sorensen JS, Bendix T: An epidemiologic study of MRI and low back pain in 13-year-old children. Spine. 2005, 30 (7): 798-806. 10.1097/01.brs.0000157424.72598.ec.CrossRefPubMed
25.
go back to reference Bo Andersen L, Wedderkopp N, Leboeuf-Yde C: Association between back pain and physical fitness in adolescents. Spine (Phila Pa 1976). 2006, 31 (15): 1740-1744. 10.1097/01.brs.0000224186.68017.e0.CrossRef Bo Andersen L, Wedderkopp N, Leboeuf-Yde C: Association between back pain and physical fitness in adolescents. Spine (Phila Pa 1976). 2006, 31 (15): 1740-1744. 10.1097/01.brs.0000224186.68017.e0.CrossRef
26.
go back to reference Tomlinson D, von Baeyer CL, Stinson JN, Sung L: A systematic review of faces scales for the self-report of pain intensity in children. Pediatrics. 2010, 126 (5): e1168-e1198. 10.1542/peds.2010-1609.CrossRefPubMed Tomlinson D, von Baeyer CL, Stinson JN, Sung L: A systematic review of faces scales for the self-report of pain intensity in children. Pediatrics. 2010, 126 (5): e1168-e1198. 10.1542/peds.2010-1609.CrossRefPubMed
27.
go back to reference Stinson JN, Kavanagh T, Yamada J, Gill N, Stevens B: Systematic review of the psychometric properties, interpretability and feasibility of self-report pain intensity measures for use in clinical trials in children and adolescents. Pain. 2006, 125 (1–2): 143-157.CrossRefPubMed Stinson JN, Kavanagh T, Yamada J, Gill N, Stevens B: Systematic review of the psychometric properties, interpretability and feasibility of self-report pain intensity measures for use in clinical trials in children and adolescents. Pain. 2006, 125 (1–2): 143-157.CrossRefPubMed
28.
go back to reference Bieri D, Reeve RA, Champion GD, Addicoat L, Ziegler JB: The Faces Pain Scale for the self-assessment of the severity of pain experienced by children: development, initial validation, and preliminary investigation for ratio scale properties. Pain. 1990, 41 (2): 139-150. 10.1016/0304-3959(90)90018-9.CrossRefPubMed Bieri D, Reeve RA, Champion GD, Addicoat L, Ziegler JB: The Faces Pain Scale for the self-assessment of the severity of pain experienced by children: development, initial validation, and preliminary investigation for ratio scale properties. Pain. 1990, 41 (2): 139-150. 10.1016/0304-3959(90)90018-9.CrossRefPubMed
29.
30.
go back to reference Murphy S, Buckle P, Stubbs D: A cross-sectional study of self-reported back and neck pain among English schoolchildren and associated physical and psychological risk factors. Appl Ergon. 2007, 38 (6): 797-804. 10.1016/j.apergo.2006.09.003.CrossRefPubMed Murphy S, Buckle P, Stubbs D: A cross-sectional study of self-reported back and neck pain among English schoolchildren and associated physical and psychological risk factors. Appl Ergon. 2007, 38 (6): 797-804. 10.1016/j.apergo.2006.09.003.CrossRefPubMed
31.
go back to reference Whittfield J, Legg SJ, Hedderley DI: Schoolbag weight and musculoskeletal symptoms in New Zealand secondary schools. Appl Ergon. 2005, 36 (2): 193-198. 10.1016/j.apergo.2004.10.004.CrossRefPubMed Whittfield J, Legg SJ, Hedderley DI: Schoolbag weight and musculoskeletal symptoms in New Zealand secondary schools. Appl Ergon. 2005, 36 (2): 193-198. 10.1016/j.apergo.2004.10.004.CrossRefPubMed
32.
go back to reference Salminen JJ: The adolescent back. A field survey of 370 Finnish schoolchildren. Acta Paediatr Scand Suppl. 1984, 315: 1-122.CrossRefPubMed Salminen JJ: The adolescent back. A field survey of 370 Finnish schoolchildren. Acta Paediatr Scand Suppl. 1984, 315: 1-122.CrossRefPubMed
33.
go back to reference Patrick DL, Burke LB, Gwaltney CJ, Leidy NK, Martin ML, Molsen E, Ring L: Content validity–establishing and reporting the evidence in newly developed patient-reported outcomes (PRO) instruments for medical product evaluation: ISPOR PRO Good Research Practices Task Force report: part 2–assessing respondent understanding. Value Health. 2011, 14 (8): 978-988. 10.1016/j.jval.2011.06.013.CrossRefPubMed Patrick DL, Burke LB, Gwaltney CJ, Leidy NK, Martin ML, Molsen E, Ring L: Content validity–establishing and reporting the evidence in newly developed patient-reported outcomes (PRO) instruments for medical product evaluation: ISPOR PRO Good Research Practices Task Force report: part 2–assessing respondent understanding. Value Health. 2011, 14 (8): 978-988. 10.1016/j.jval.2011.06.013.CrossRefPubMed
35.
go back to reference Williamson A, Hoggart B: Pain: a review of three commonly used pain rating scales. J ClinNurs. 2005, 14 (7): 798-804. Williamson A, Hoggart B: Pain: a review of three commonly used pain rating scales. J ClinNurs. 2005, 14 (7): 798-804.
37.
go back to reference Beaton DE, Bombardier C, Guillemin F, Ferraz MB: Guidelines for the process of cross-cultural adaptation of self-report measures. Spine. 2000, 25 (24): 3186-3191. 10.1097/00007632-200012150-00014.CrossRefPubMed Beaton DE, Bombardier C, Guillemin F, Ferraz MB: Guidelines for the process of cross-cultural adaptation of self-report measures. Spine. 2000, 25 (24): 3186-3191. 10.1097/00007632-200012150-00014.CrossRefPubMed
38.
go back to reference Briggs AM, Straker LM, Bear NL, Smith AJ: Neck/shoulder pain in adolescents is not related to the level or nature of self-reported physical activity or type of sedentary activity in an Australian pregnancy cohort. BMC Musculoskelet Disord. 2009, 10: 87-10.1186/1471-2474-10-87.CrossRefPubMedPubMedCentral Briggs AM, Straker LM, Bear NL, Smith AJ: Neck/shoulder pain in adolescents is not related to the level or nature of self-reported physical activity or type of sedentary activity in an Australian pregnancy cohort. BMC Musculoskelet Disord. 2009, 10: 87-10.1186/1471-2474-10-87.CrossRefPubMedPubMedCentral
39.
go back to reference Murphy S, Buckle P: Back pain amongst schoolchildren and associated risk factors. Proceedings of the XVth Tiennial Congress of the International Ergonomics Association and the 7th Joint Conference of the Ergonomics Society of Korea/Japan Ergonomics Society: August 24-29 2003. 2003, Seoul, Korea, 16-20. Murphy S, Buckle P: Back pain amongst schoolchildren and associated risk factors. Proceedings of the XVth Tiennial Congress of the International Ergonomics Association and the 7th Joint Conference of the Ergonomics Society of Korea/Japan Ergonomics Society: August 24-29 2003. 2003, Seoul, Korea, 16-20.
40.
go back to reference Balague F, Dutoit G, Waldburger M: Low back pain in schoolchildren. An epidemiological study. Scand J Rehabil Med. 1988, 20 (4): 175-179.PubMed Balague F, Dutoit G, Waldburger M: Low back pain in schoolchildren. An epidemiological study. Scand J Rehabil Med. 1988, 20 (4): 175-179.PubMed
41.
go back to reference Korovessis P, Koureas G, Papazisis Z: Correlation between backpack weight and way of carrying, sagittal and frontal spinal curvatures, athletic activity, and dorsal and low back pain in schoolchildren and adolescents. J Spinal Disord Tech. 2004, 17 (1): 33-40. 10.1097/00024720-200402000-00008.CrossRefPubMed Korovessis P, Koureas G, Papazisis Z: Correlation between backpack weight and way of carrying, sagittal and frontal spinal curvatures, athletic activity, and dorsal and low back pain in schoolchildren and adolescents. J Spinal Disord Tech. 2004, 17 (1): 33-40. 10.1097/00024720-200402000-00008.CrossRefPubMed
42.
go back to reference Troussier B, Marchou-Lopez S, Pironneau S, Alais E, Grison J, Prel G, Pequegnot C, Degaudemaris R, Phelip X: Back pain and spinal alignment abnormalities in schoolchildren. Rev Rhum Engl Ed. 1999, 66 (7–9): 370-380.PubMed Troussier B, Marchou-Lopez S, Pironneau S, Alais E, Grison J, Prel G, Pequegnot C, Degaudemaris R, Phelip X: Back pain and spinal alignment abnormalities in schoolchildren. Rev Rhum Engl Ed. 1999, 66 (7–9): 370-380.PubMed
43.
go back to reference Balague F, Damidot P, Nordin M, Parnianpour M, Waldburger M: Cross-sectional study of the isokinetic muscle trunk strength among school children. Spine (Phila Pa 1976). 1993, 18 (9): 1199-1205. 10.1097/00007632-199307000-00013.CrossRef Balague F, Damidot P, Nordin M, Parnianpour M, Waldburger M: Cross-sectional study of the isokinetic muscle trunk strength among school children. Spine (Phila Pa 1976). 1993, 18 (9): 1199-1205. 10.1097/00007632-199307000-00013.CrossRef
44.
go back to reference von Baeyer CL, Spagrud LJ, McCormick JC, Choo E, Neville K, Connelly MA: Three new datasets supporting use of the Numerical Rating Scale (NRS-11) for children’s self-reports of pain intensity. Pain. 2009, 143 (3): 223-227. 10.1016/j.pain.2009.03.002.CrossRefPubMed von Baeyer CL, Spagrud LJ, McCormick JC, Choo E, Neville K, Connelly MA: Three new datasets supporting use of the Numerical Rating Scale (NRS-11) for children’s self-reports of pain intensity. Pain. 2009, 143 (3): 223-227. 10.1016/j.pain.2009.03.002.CrossRefPubMed
Metadata
Title
Development of the young spine questionnaire
Authors
Henrik Hein Lauridsen
Lise Hestbaek
Publication date
01-12-2013
Publisher
BioMed Central
Published in
BMC Musculoskeletal Disorders / Issue 1/2013
Electronic ISSN: 1471-2474
DOI
https://doi.org/10.1186/1471-2474-14-185

Other articles of this Issue 1/2013

BMC Musculoskeletal Disorders 1/2013 Go to the issue