[1] Univ Indonesia, Dr Ciptomangunkusumo Hosp, Dept Neurol, Fac Med, Jakarta, Indonesia
[2] Natl Canc Ctr Dharmais Hosp, Jakarta, Indonesia
[3] Gadjah Mada Univ Indonesia, Dept Biostat Epidemiol & Populat Hlth, Fac Med Publ Hlth & Nursing, Yogyakarta, Indonesia