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Tjia, J., Briesacher, B.A., Soumerai, S.B. et al. Medicare Beneficiaries and Free Prescription Drug Samples: A National Survey. J GEN INTERN MED 23, 1727 (2008). https://doi.org/10.1007/s11606-008-0745-3
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DOI: https://doi.org/10.1007/s11606-008-0745-3