[1] Dharmais Hosp, Natl Canc Ctr, Jakarta, Indonesia
[2] Tarumanegara Univ, Dept Neurol, Fac Med, Jakarta, Indonesia
[3] Univ Gadjah Mada, Dept Biostat Epidemiol & Populat Hlth, Fac Med, Yogyakarta, Indonesia
[4] Univ Gadjah Mada, Dept Surg, Fac Med, Yogyakarta, Indonesia
[5] Univ Gadjah Mada, Fac Med, Dept Neurol, Yogyakarta, Yogyakarta, Indonesia