WORLD JOURNAL OF GASTROENTEROLOGY, Volume 15, Issue 37,2009, Pages 4627-4637, doi:10.3748/wjg.15.4627
SHANDONG MEDICAL JOURNAL, Volume 49, Issue 37,2009, Pages 61-62, doi:10.3969/j.issn.1002-266X.2009.37.028
SHANDONG MEDICAL JOURNAL, Volume 49, Issue 37,2009, Pages 5-6, doi:10.3969/j.issn.1002-266X.2009.37.003
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 89, Issue 37,2009, Pages 2649-2653, doi:10.3760/cma.j.issn.0376-2491.2009.37.014