[1] Natl Inst Infect Dis, Tokyo, Japan
[2] Tohoku Univ, Grad Sch Med, Sendai, Miyagi, Japan
[3] Kurume Univ, Sch Med, Fukuoka, Japan
[4] Niigata Prefectural Shibata Hosp, Niigata, Japan
[5] Sapporo Med Univ, Sch Med, Sapporo, Hokkaido, Japan
[6] Natl Hosp Org Mie Natl Hosp, Tsu, Mie, Japan
[7] Yamagata Saisei Hosp, Yamagata, Japan
[8] Nara Med Univ, Nara, Japan
[9] Univ Ryukyus, Grad Sch Med, Nishihara, Okinawa, Japan
[10] Kagoshima Univ, Grad Sch Med & Dent Sci, Kagoshima, Japan
[11] Kochi Univ, Kochi Med Sch, Kochi, Japan
[12] Toyama Inst Hlth, Toyama, Japan