[1] Cincinnati Childrens Hosp Med Ctr, Div Clin Pharmacol, Cincinnati, OH 45229 USA
[2] Kyoto Univ, Kyoto Univ Hosp, Dept Clin Pharmacol & Therapeut, Kyoto, Japan
[3] Kyoto Univ Hosp, Dept Surg, Div Hepatobiliary Pancreat Surg & Transplantat, Kyoto 606, Japan
[4] Univ Cincinnati, Coll Med, Dept Pediat, Cincinnati, OH USA