Roeb Elke, Benders Jens, Matern Siegfried
Department of Medicine, Medical Clinic III, University Hospital Aachen, Aachen University (RWTH), Pauwelsstrasse 30, 52057 Aachen, Germany.
Gastrointest Endosc. 2004 Dec;60(6):1026-8. doi: 10.1016/s0016-5107(04)02192-3.