[1] Sapporo Tetsudo JR Hosp, Dept Pediat, Chuo Ku, Sapporo, Hokkaido 0600033, Japan
[2] Sapporo Med Univ, Sch Med, Dept Internal Med 3, Chuo Ku, Sapporo, Hokkaido 0608556, Japan
[3] Hlth Sci Univ Hokkaido, Dept Pediat, Kita Ku, Sapporo, Hokkaido 0028072, Japan
[4] Hokkaido Univ, Sch Med, Dept Gene Therapy, Kita Ku, Sapporo, Hokkaido 0608638, Japan