WORLD JOURNAL OF GASTROENTEROLOGY, Volume 9, Issue 1,2003, Pages 22-25,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 9, Issue 1,2003, Pages 169-173,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 9, Issue 1,2003, Pages 117-121,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 9, Issue 1,2003, Pages 160-164,