WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 3,2009, Pages 280-288, doi:10.3748/wjg.15.280
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 3,2009, Pages 369-372, doi:10.3748/wjg.15.369
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 3,2009, Pages 300-309, doi:10.3748/wjg.15.300
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 3,2009, Pages 376-377, doi:10.3748/wjg.15.376