[1] Steel Mem Muroran Hosp, Dept Pediat, 45-1 Chiribetsucho, Muroran, Hokkaido 0500076, Japan
[2] Sapporo Med Univ, Sch Med, Dept Pediat, Chuo Ku, South 1,West 16, Sapporo, Hokkaido 0608543, Japan
[3] Hokkaido Med Ctr Child Hlth & Rehabil, Dept Pediat Cardiol & Pediat Intens Care, Kanayama Teine Ku, 6-240-1-1 Kanayama Teine Ku, Sapporo, Hokkaido 0060041, Japan
[4] Iwamizawa Municipal Gen Hosp, Dept Pediat, 2 West 7,9 Jo, Iwamizawa, Hokkaido 0688555, Japan
[5] Japan Red Cross Urakawa Hosp, Dept Pediat, 1-2-1 Chinomi, Urakawacho, Hokkaido 0570007, Japan
[6] NTT Med Ctr Sapporo, Dept Pediat, South 1,West 15, Sapporo, Hokkaido 0600061, Japan
[7] Otaru Kyokai Hosp, Dept Pediat, 15-6-1 Suminoe, Otaru, Hokkaido 0478510, Japan
[8] Hokkaido Med Ctr, Dept Pediat, Nishi Ku, 1-1-7-5 Yamanote, Sapporo, Hokkaido 0630005, Japan
[9] Japan Community Hlth Care Org Sapporo Hokushin Ho, Dept Pediat, Atsubetsu Ku, 1-2-6-2 Atsubetsuchuo, Sapporo, Hokkaido 0048618, Japan
[10] Kushiro City Gen Hosp, Dept Pediat, 12-1 Shunkodai, Kushiro, Hokkaido 0850822, Japan
[11] Nemuro City Hosp, Dept Pediat, 2-1 Ariisocho, Nemuro, Hokkaido 0878686, Japan
[12] Hakodate Municipal Hosp, Dept Pediat, 1-10-1 Minatomachi, Hakodate, Hokkaido 0418680, Japan
[13] Sunagawa City Med Ctr, Dept Pediat, 1-1,North 3,West 4, Sunagawa, Hokkaido 0730196, Japan
[14] Takikawa Municipal Hosp, Dept Pediat, 34-2-2 Oomachi, Takikawa, Hokkaido 0730022, Japan
[15] Hokkaido Esashi Hosp, Dept Pediat, 484 Fushikidocho, Hiyamagun Esashicho, Hokkaido 0430022, Japan
[16] Tomakomai City Hosp, Dept Pediat, 20-5-1 Shimizucho, Tomakomai, Hokkaido 0538567, Japan
[17] Yakumo Gen Hosp, Dept Pediat, 50 Shinonomecho, Futamigun Yakumocho, Hokkaido 0493197, Japan
[18] Rumoi City Hosp, Dept Pediat, 1-16-2 Shinonomecho, Rumoi, Hokkaido 0778511, Japan
[19] Sapporo Med Univ, Sch Med, Dept Pediat, Sapporo, Hokkaido, Japan
[20] Otrau Child Clin, Otrau, Hokkaido, Japan
[21] Fukushima Rehabil Ctr Children, Dept Pediat, Fukushima, Japan