WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 1,2009, Pages 106-111, doi:10.3748/wjg.15.106
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 1,2009, Pages 48-54, doi:10.3748/wjg.15.48
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 1,2009, Pages 117-120, doi:10.3748/wjg.15.117
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 1,2009, Pages 17-24, doi:10.3748/wjg.15.17
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 1,2009, Pages 1-16, doi:10.3748/wjg.15.1