WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 17,2009, Pages 2049-2066, doi:10.3748/wjg.15.2049
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 17,2009, Pages 2125-2131, doi:10.3748/wjg.15.2125
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 17,2009, Pages 2078-2080, doi:10.3748/wjg.15.2078
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 17,2009, Pages 2139-2144, doi:10.3748/wjg.15.2139