WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 5,2009, Pages 561-569, doi:10.3748/wjg.15.561
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 5,2009, Pages 633-635, doi:10.3748/wjg.15.633
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 5,2009, Pages 612-614, doi:10.3748/wjg.15.612
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 5,2009, Pages 526-530, doi:10.3748/wjg.15.526