WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 42,2009, Pages 5307-5315, doi:10.3748/wjg.15.5307
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 42,2009, Pages 5360-5363, doi:10.3748/wjg.15.5360
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 42,2009, Pages 5372,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 42,2009, Pages 5368-5370, doi:10.3748/wjg.15.5368