WORLD JOURNAL OF GASTROENTEROLOGY, Volume 14, Issue 44,2008, Pages 6802-6807, doi:10.3748/wjg.14.6802
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 14, Issue 44,2008, Pages 6831-6834, doi:10.3748/wjg.14.6831
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 14, Issue 44,2008, Pages 6853-6857, doi:10.3748/wjg.14.6853