WORLD JOURNAL OF GASTROENTEROLOGY, , Issue 1,1999, Pages 7,
WORLD JOURNAL OF GASTROENTEROLOGY, , Issue 1,1999, Pages 12,
WORLD JOURNAL OF GASTROENTEROLOGY, , Issue 1,1999, Pages 4,
WORLD JOURNAL OF GASTROENTEROLOGY, , Issue 1,1999, Pages 2,
WORLD JOURNAL OF GASTROENTEROLOGY, , Issue 1,1999, Pages 75,