WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 8,2009, Pages 978-982, doi:10.3748/wjg.15.978
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 8,2009, Pages 942-954, doi:10.3748/wjg.15.942
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 8,2009, Pages 927-935, doi:10.3748/wjg.15.927
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 8,2009, Pages 990-995, doi:10.3748/wjg.15.990
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 8,2009, Pages 936-941, doi:10.3748/wjg.15.936