WORLD JOURNAL OF GASTROENTEROLOGY, Volume 13, Issue 12,2007, Pages 1788-1793,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 13, Issue 12,2007, Pages 1862-1866,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 13, Issue 12,2007, Pages 1885-1886,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 13, Issue 12,2007, Pages 1820-1823,