[1] Hosp Sultanah Nur Zahirah, Dept Neurol, Kuala Terengganu, Malaysia
[2] Hosp Sultanah Nur Zahirah, Clin Res Ctr, Kuala Terengganu, Malaysia
[3] Pfizer Malaysia, Hlth & Value, Level 10 & 11, Kuala Lumpur 59200, Malaysia
[4] Hosp Sultanah Nur Zahirah, Dept Pharm, Kuala Terengganu, Malaysia
[5] Hosp Sultan Haji Ahmad Shah, Board Management, Temerloh, Malaysia
[6] Hosp Seberang Jaya, Dept Med, Prai, Malaysia
[7] Hosp Seberang Jaya, Clin Res Ctr, Prai, Malaysia
[8] Hosp Kuala Lumpur, Dept Neurol, Kuala Lumpur, Malaysia
[9] Univ Putra Malaysia, Dept Med, Fac Med & Hlth Sci, Kuala Lumpur, Malaysia