1. Department of Medical Sciences, School of Healthcare and Medical Sciences, Sunway University, 5 Jalan University, Bandar Sunway, Selangor, Malaysia
2. Department of Family Medicine, Faculty of Medicine and Health Sciences, Universiti Putra Malaysia, Serdang, Selangor, Malaysia
3. Staff Health Unit, University of Malaya Medical Centre, Jalan Universiti, Lembah Pantai, Kuala Lumpur, Malaysia
4. Department of Family Medicine, School of Medical Sciences, Health Campus, Universiti Sains Malaysia, Kubang Kerian, Kota Bahru, Kelantan, Malaysia
5. Jalan Masjid Health Clinic, Jalan Masjid, Kuching, Sarawak, Malaysia
6. Padang Rengas Health Clinic, Padang Rengas, Taiping, Perak, Malaysia
7. Department of Family Medicine, International Medical University, Jalan Dr Muthu, Bukit Rasah, Seremban, Negeri Sembilan, Malaysia
8. Sarikei Health Clinic, Bandar Sarikei, Sarikei, Sarawak, Malaysia
9. Segamat Health Clinic, Jalan Muar, 85000Segamat, Johor, Malaysia
10. Department of Family Medicine, Kulliyah of Medicine, International Islamic University Malaysia, Bandar Indera Mahkota Campus, Jalan Sultan Ahmad Shah, Kuantan Pahang, Malaysia
11. Imperial Clinical Trials Unit, Imperial College London, Stadium House, 68 Wood Lane, London, UK