1. Department of Internal Medicine, Kulliyyah of Medicine, International Islamic University Malaysia (IIUM), Kuantan, Malaysia.
2. Department of Community Medicine, Kulliyyah of Medicine, International Islamic University Malaysia (IIUM), Kuantan, Malaysia.
3. Department of Psychiatry, Kulliyyah of Medicine, International Islamic University Malaysia (IIUM), Kuantan, Malaysia.
4. Department of Respiratory Medicine, Penang General Hospital, George Town, Malaysia.