[1] Natl Ctr Child Hlth & Dev, Ctr Postgrad Educ & Training, Tokyo, Japan
[2] Natl Ctr Child Hlth & Dev, Div Gastroenterol, 2-10-1 Okura,Setagaya Ku, Tokyo, Japan
[3] Natl Ctr Child Hlth & Dev, Dept Pathol, Tokyo, Japan
[4] Jichi Med Univ, Dept Internal Med, Div Gastroenterol, Shimotsuke, Tochigi, Japan
[5] Jichi Med Univ, Dept Pediat, Shimotsuke, Tochigi, Japan