WORLD JOURNAL OF GASTROENTEROLOGY, Volume 10, Issue 23,2004, Pages 3518-3521,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 10, Issue 23,2004, Pages 3480-3484,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 10, Issue 23,2004, Pages 3537-3541,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 10, Issue 23,2004, Pages 3405-3408,