Nikolaidis Nikolaos, Giouleme Olga, Gkisakis Dimitrios, Grammatikos Nikolaos
2nd Propaedeutic Department of Medicine, Section of Gastroenterology and Hepatology, Aristotle University of Thessaloniki, Greece.
Gastrointest Endosc. 2005 May;61(6):771-2. doi: 10.1016/s0016-5107(04)02836-6.