[1] Natl Univ Singapore Hosp, Dept Med, Div Neurol, Singapore 119074, Singapore
[2] Natl Univ Singapore, Yong Loo Lin Sch Med, Cardiovasc Metab Translat Res Program, Singapore 119077, Singapore
[3] Natl Univ Singapore, Yong Loo Lin Sch Med, Dept Med, Singapore 119077, Singapore
[4] Raffles Hosp, Raffles Neurosci Ctr, Singapore 188770, Singapore
[5] Khoo Teck Puat Natl Univ, Childrens Med Inst, Natl Univ Hosp, Singapore 119074, Singapore
[6] Natl Univ Singapore, Yong Loo Lin Sch Med, Dept Paediat, Singapore 119077, Singapore