[1] Univ Malaya, Fac Med, Dept Primary Care Med, Kuala Lumpur, Malaysia
[2] Univ Malaya, Fac Med, UM eHlth Unit, Kuala Lumpur, Malaysia
[3] Univ Putra Malaysia, Fac Med & Hlth Sci, Dept Family Med, Seri Kembangan, Malaysia
[4] UCSI Univ, Fac Business & Management, Kuala Lumpur, Malaysia
[5] Univ Malaya, Fac Med, Dept Med, Kuala Lumpur, Malaysia
[6] Kuala Lumpur Women & Children Hosp, Minist Hlth, Kuala Lumpur, Malaysia
[7] Univ Edinburgh, Usher Inst, Edinburgh Clin Trials Unit, Edinburgh, Scotland
[8] Univ Edinburgh, Usher Inst, NIHR Global Hlth Res Unit Resp Hlth RESPIRE, Edinburgh, Scotland
[9] Univ Edinburgh, Ctr Inflammat Res, Child Life & Hlth, Edinburgh, Scotland
[10] Univ Malaya, Fac Med, Dept Primary Care Med, Kuala Lumpur 50603, Malaysia