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WORLD JOURNAL OF GASTROENTEROLOGY, Volume 16, Issue 20,2010, Pages 2458-2462, doi:10.3748/wjg.v16.i20.2458
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 16, Issue 20,2010, Pages 2558-2565, doi:10.3748/wjg.v16.i20.2558
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 16, Issue 20,2010, Pages 2537-2541, doi:10.3748/wjg.v16.i20.2537
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 16, Issue 20,2010, Pages 2571-2576, doi:10.3748/wjg.v16.i20.2571