WORLD JOURNAL OF GASTROENTEROLOGY, Volume 9, Issue 3,2003, Pages 553-556,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 9, Issue 3,2003, Pages 572-577,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 9, Issue 3,2003, Pages 578-583,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 9, Issue 3,2003, Pages 437-441,