[1] Univ Putra Malaysia, Dept Family Med, Fac Med & Hlth Sci, Serdang, Selangor, Malaysia
[2] Univ Malaya, Dept Primary Care Med, Fac Med, Kuala Lumpur, Malaysia
[3] Univ Malaya, Dept Primary Care Med 1, Fac Med, Kuala Lumpur, Malaysia
[4] Sunway Univ, Sch Healthcare & Med Sci, Dept Med Sci, Selangor, Malaysia