[1] Univ Ryukyus, Grad Sch Hlth Sci, Okinawa, Japan
[2] Tribhuvan Univ, Dept Community Med & Family Hlth, Inst Med, Kathmandu, Nepal
[3] Univ Tokyo, Dept Community & global Hlth, Grad Sch Med, Tokyo, Japan
[4] Univ Ryukyus, Maternal & Child & Global Hlth Unit, Sch Hlth Sci, Fac Med, Okinawa, Japan