[1] Raffles Hosp, Raffles Neurosci Ctr, 585 N Bridge Rd, Singapore 77880, Singapore
[2] Peking Univ, Hlth Sci Ctr, George Inst Global Hlth, Beijing, Peoples R China
[3] GB Pant Inst Med Educ & Res, Dept Neurol, New Delhi, India
[4] Kaohsiung Med Univ & Hosp, Dept Neurol, Stroke Ctr, Kaohsiung, Taiwan
[5] Univ Malaya, Dept Med, Fac Med, Kuala Lumpur, Malaysia
[6] Univ Hong Kong, Dept Med, Hong Kong, Hong Kong, Peoples R China