WORLD JOURNAL OF GASTROENTEROLOGY, Volume 13, Issue 27,2007, Pages 3662-3666,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 13, Issue 27,2007, Pages 3677-3683,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 13, Issue 27,2007, Pages 3767-3769,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 13, Issue 27,2007, Pages 3776-3777,