WORLD JOURNAL OF GASTROENTEROLOGY, Volume 14, Issue 33,2008, Pages 5138-5148, doi:10.3748/wjg.14.5138
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 14, Issue 33,2008, Pages 5186-5191, doi:10.3748/wjg.14.5186
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 14, Issue 33,2008, Pages 5110-5114, doi:10.3748/wjg.14.5110
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 14, Issue 33,2008, Pages 5162-5175, doi:10.3748/wjg.14.5162