WORLD JOURNAL OF GASTROENTEROLOGY, Volume 5, Issue 6,1999, Pages 538-540,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 5, Issue 6,1999, Pages 465-469,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 5, Issue 6,1999, Pages 477-482,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 5, Issue 6,1999, Pages 506-510,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 5, Issue 6,1999, Pages 518-521,