WORLD JOURNAL OF GASTROENTEROLOGY, Volume 8, Issue 6,2002, Pages 1029-1034,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 8, Issue 6,2002, Pages 1112-1116,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 8, Issue 6,2002, Pages 1123-1128,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 8, Issue 6,2002, Pages 1059-1062,