[1] Univ Malaya, Fac Med, Dept Med, Div Neurol, Kuala Lumpur, Malaysia
[2] Univ Kebangsaan Malaysia, Med Ctr, Dept Med, Neurol Unit, Kuala Lumpur, Malaysia
[3] Univ Malaya, Fac Med, Dept Paediat, Div Neurol, Kuala Lumpur, Malaysia
[4] Hosp Tunku Azizah, Dept Paediat, Kuala Lumpur, Malaysia
[5] KPJ Damansara Specialist Hosp, Petaling Jaya, Selangor, Malaysia
[6] Sarawak Gen Hosp, Dept Med, Div Neurol, Kuching, Sarawak, Malaysia
[7] Monash Univ Malaysia, Jeffrey Cheah Sch Med & Hlth Sci, Neuropharmacol Res Lab, Subang Jaya, Selangor, Malaysia
[8] Charles Sturt Univ, Sch Dent & Med Sci, Orange, NSW, Australia
[9] Assunta Hosp, Dept Med, Petaling Jaya, Selangor, Malaysia
[10] Sunway Med Ctr, Dept Med, Subang Jaya, Selangor, Malaysia
[11] Subang Jaya Med Ctr, Dept Med, Subang Jaya, Selangor, Malaysia
[12] Hosp Kuala Lumpur, Neurol Dept, Kuala Lumpur, Malaysia
[13] Univ Kebangsaan Malaysia, Med Ctr, Dept Paediat, Neurol Unit, Kuala Lumpur, Malaysia
[14] Univ Teknol MARA, Fac Med, Dept Med, Neurol Unit, Shah Alam, Selangor, Malaysia
[15] Univ Malaya, Med Ctr, Neurol Lab, Level 6 Menara Selatan, Kuala Lumpur 50603, Malaysia