[1] Fujita Hlth Univ, Dept Pediat, Sch Med, Toyoake, Japan
[2] Univ Tokyo, Grad Sch Med, Dept Hlth Serv Res, Tokyo, Japan
[3] Univ Tsukuba, Dev Ctr, Hlth Serv Res, Tsukuba, Japan
[4] Univ Tokyo, Sch Publ Hlth, Dept Clin Epidemiol & Hlth Econ, Tokyo, Japan
[5] Tokyo Med & Dent Univ, Dept Hlth Policy & Informat, Grad Sch Med, Tokyo, Japan
[6] Fujita Hlth Univ, Dept Pediat, Sch Med, 1-98 Dengakugakubo,Kut Sukake Cho, Toyoake, Aichi 4701192, Japan