Department of Gastroenterology and Hepatology;
University Medical Center Utrecht;
3508 GA Utrecht;
The Netherlands;
Division of Gastroenterology and Hepatology;
Kansas City Veterans Administration Medical Center;
Kansas City;
MO 64128;
United States;
Department of Gastroenterology;
Bayside Endoscopy Center;
33 Staniford Street;
Providence;
RI 02905;
United States;
Department of Gastroenterology;
Cliniques Universitaires Saint-Luc;
Université Catholique de Louvain;
B-1200 Brussels;
Belgium;
Department of Gastroenterology and Hepatology;
Dartmouth-Hitchcock Medical Center;
One Medical Center Drive;
Lebanon;
NH 03756;
United States;
Department of Gastroenterology;
Istituto Clinico Humanitas;
20089 Rozzano;
Italy;
Department of Internal Medicine;
Division of Gastroenterology and Hepatology;
Johns Hopkins Hospital;
Baltimore;
MD 21205;
United States;
Wolfson Unit for Endoscopy;
St.Mark's Hospital;
Harrow HA1 3UJ;
United Kingdom;
Department of Internal Medicine;
Division of Gastroenterology;
Baylor University Medical Center;
Dallas;
TX 75246;
United States;