WORLD JOURNAL OF GASTROENTEROLOGY, Volume 13, Issue 21,2007, Pages 2983-2985,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 13, Issue 21,2007, Pages 2978-2982,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 13, Issue 21,2007, Pages 2932-2938,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 13, Issue 21,2007, Pages 2992-2998,