WORLD JOURNAL OF GASTROENTEROLOGY, Volume 9, Issue 2,2003, Pages 316-319,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 9, Issue 2,2003, Pages 368-372,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 9, Issue 2,2003, Pages 309-311,
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 9, Issue 2,2003, Pages 291-294,