[1] Univ Philippines, Philippine Gen Hosp, Div Neurosurg, Manila, Philippines
[2] Univ Philippines, Coll Med, Dept Anat, Manila, Philippines
[3] Natl Univ Singapore Hosp, Div Neurosurg, Singapore, Singapore
[4] Padjadjaran State Univ, Hasan Sadikin Hosp, Div Pediat Neurosurg, Bandung, West Java, Indonesia
[5] Univ Malaya, Dept Surg, Fac Med, Kuala Lumpur, Malaysia
[6] Queen Sirikit Natl Inst Child Hlth, Div Neurosurg, Dept Surg, Bangkok, Thailand