[1] Tohoku Univ, Grad Sch Med, Dept Med, Div Nephrol Endocrinol & Vasc Med, Sendai, Miyagi 980, Japan
[2] Tohoku Univ, Grad Sch Med, Dept Surg, Div Gastroenterol Surg,Aoba Ku, Sendai, Miyagi 9808574, Japan
[3] Sankyo Co Ltd, Drug Metab & Pharmacokinet Res Labs, Tokyo 140, Japan