WORLD JOURNAL OF GASTROENTEROLOGY, Volume 13, Issue 5,2007, Pages 801-803,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 13, Issue 5,2007, Pages 768-773,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 13, Issue 5,2007, Pages 806-808,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 13, Issue 5,2007, Pages 804-805,