WORLD JOURNAL OF GASTROENTEROLOGY, Volume 9, Issue 8,2003, Pages 1863-1865,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 9, Issue 8,2003, Pages 1799-1803,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 9, Issue 8,2003, Pages 1762-1766,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 9, Issue 8,2003, Pages 1713-1718,