[1] Univ Sains Malaysia, Sch Med Sci, Dept Neurosci, Hlth Campus, Kubang Kerian, Kelantan, Malaysia
[2] Univ Sains Malaysia, Sch Med Sci, Brain & Behav Cluster, Hlth Campus, Kubang Kerian, Kelantan, Malaysia
[3] Univ Sains Malaysia, Sch Med Sci, Dept Community Med, Hlth Campus, Kubang Kerian, Kelantan, Malaysia
[4] Univ Putra Malaysia, Fac Med & Hlth Sci, Dept Nursing & Rehabil, Serdang, Selangor, Malaysia
[5] Univ Putra Malaysia, Malaysian Res Inst Ageing MyAgeingTM, Serdang, Selangor, Malaysia
[6] Univ Teknol MARA, Fac Med, Dept Publ Hlth Med, Sungai Buloh Campus, Sungai Buloh, Selangor, Malaysia
[7] Univ Sains Malaysia, Sch Hlth Sci, Interdisciplinary Hlth Sci Unit, Hlth Campus, Kubang Kerian, Kelantan, Malaysia
[8] Univ Sains Malaysia, Hosp Univ Sains Malaysia, Dept Neurosci & Brain Behav Cluster, Hlth Campus, Kubang Kerian, Kelantan, Malaysia
[9] London Sch Hyg & Trop Med, Fac Epidemiol & Populat Hlth, Dept Noncommunicable Dis & Epidemiol, Keppel St, London, England
[10] London Sch Hyg & Trop Med, Fac Infect & Trop Dis, Dept Clin Res, Keppel St, London, England