WORLD JOURNAL OF GASTROENTEROLOGY, Volume 9, Issue 7,2003, Pages 1516-1520,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 9, Issue 7,2003, Pages 1550-1553,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 9, Issue 7,2003, Pages 1409-1414,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 9, Issue 7,2003, Pages 1439-1443,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 9, Issue 7,2003, Pages 1633-1633,