WORLD JOURNAL OF GASTROENTEROLOGY, Volume 7, Issue 2,2001, Pages 216-221,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 7, Issue 2,2001, Pages 170-174,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 7, Issue 2,2001, Pages 185-192,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 7, Issue 2,2001, Pages 149-151,