WORLD JOURNAL OF GASTROENTEROLOGY, Volume 13, Issue 30,2007, Pages 4091-4095,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 13, Issue 30,2007, Pages 4100-4102,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 13, Issue 30,2007, Pages 4108-4111,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 13, Issue 30,2007, Pages 4056-4063,