1. Centre for Healthcare Quality Research, Institute for Health Systems Research, National Institutes of Health, Ministry of Health Malaysia , Jalan Setia Murni U13/52, Section U13 Setia Alam, Shah Alam, Selangor 40170, Malaysia
2. Division of Epidemiology, University of California San Francisco, Institute for Global Health Sciences , Mission Hall: Global Health & Clinical Sciences Building, 550 16th Street, Third Floor, San Francisco, CA 94158, United States
3. Faculty of Pharmacy, Universiti Teknologi MARA Selangor, Puncak Alam Campus , Bandar Puncak Alam, Selangor 42300, Malaysia
4. Pharmaceutical Policy and Strategic Planning Division, Ministry of Health Malaysia , Lot 36, Jalan Profesor Diraja Ungku Aziz, Petaling Jaya, Selangor 46200, Malaysia