[1] Univ Malaya, Fac Med, Dept Med, Kuala Lumpur 50603, Malaysia
[2] Univ Malaya, Fac Med, Dept Primary Care Med, Kuala Lumpur 50603, Malaysia
[3] Univ Malaya, Fac Med, Med Educ & Res Dev Unit, Kuala Lumpur 50603, Malaysia
[4] Univ Aberdeen, Kuala Lumpur, Malaysia
[5] Univ Malaya, Fac Med, Dept Social & Prevent Med, Kuala Lumpur 50603, Malaysia
[6] Univ Malaya, Fac Med, Deans Off, Kuala Lumpur 50603, Malaysia