[1] Kyoto Prefectural Univ Med, Dept Hyg, Kamigyo Ku, Kyoto 6028566, Japan
[2] Kyoto Prefectural Univ Med, Dept Internal Med, Kamigyo Ku, Kyoto 6028566, Japan
[3] Kyoto Prefectural Univ Med, Dept Surg, Kamigyo Ku, Kyoto 6028566, Japan
[4] Hyogo Coll Med, Dept Biochem, Nishinomiya, Hyogo, Japan
[5] St Jude Childrens Res Hosp, Dept Pathol, Memphis, TN 38105 USA