[1] Tokyo Metropolitan Org Med Res, Tokyo Inst Psychiat, Setagaya Ku, Tokyo 156, Japan
[2] Univ Tokyo, Fac Med, Dept Surg 2, Tokyo 113, Japan
[3] Univ Tokyo, Fac Med, Dept Pediat Surg, Tokyo 113, Japan
[4] Harvard Univ, Massachusetts Gen Hosp, Sch Med, Boston, MA USA