WORLD JOURNAL OF GASTROENTEROLOGY, Volume 14, Issue 4,2008, Pages 532-540, doi:10.3748/wjg.14.532
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 14, Issue 4,2008, Pages 511-517, doi:10.3748/wjg.14.511
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 14, Issue 4,2008, Pages 627-631, doi:10.3748/wjg.14.627
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 14, Issue 4,2008, Pages 547-553, doi:10.3748/wjg.13.6127