[1] Mahidol Univ, Ramathibodi Hosp, Fac Med, Ramathibodi Sch Nursing, Bangkok, Thailand
[2] Mahidol Univ, Fac Publ Hlth, Dept Epidemiol, Bangkok, Thailand
[3] Mahidol Univ, Ramathibodi Hosp, Fac Med, Div Neurol,Dept Med, Bangkok, Thailand
[4] Mahidol Univ, Fac Publ Hlth, Dept Publ Hlth Adm, Bangkok, Thailand
[5] Minist Publ Hlth, Int Hlth Policy Program, Muang Dist, Nonthaburi Prov, Thailand