Published in: 01-01-2002 Bidirectional endoscopy in patients with fecal occult blood Authors: J.P. Velez, W.H. Schwesinger, J. Stauffer, H.V. Gaskill, G.B. Kazantsev, K.R. Sirinek, W.E. Strodel Published in: Surgical Endoscopy | Issue 1/2002 Login to get access