WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 2,2009, Pages 211-218, doi:10.3748/wjg.15.211
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 2,2009, Pages 151-159, doi:10.3748/wjg.15.151
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 2,2009, Pages 226-230, doi:10.3748/wjg.15.226
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 2,2009, Pages 192-197, doi:10.3748/wjg.15.192
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 2,2009, Pages 198-203, doi:10.3748/wjg.15.198