[1] Univ Malaya, Dept Rehabil Med, Fac Med, Kuala Lumpur 50630, Malaysia
[2] Curtin Univ Technol, Ctr Res Disabil & Soc, Curtin Hlth Innovat Res Inst, Perth, WA, Australia
[3] Univ Malaya, Dept Social Prevent Med, Kuala Lumpur 50630, Malaysia
[4] Monash Univ, Sch Hlth & Med & Hlth Sci, Bandar Sunway, Malaysia