1. Department of Medicine, Faculty of Medicine, Universiti Kebangsaan Malaysia Medical Center (UKMMC) , 56000 Cheras, Kuala Lumpur , Malaysia
2. Hospital Canselor Tuanku Muhriz, Jalan Yaacob Latif, Bandar Tun Razak , 56000 Kuala Lumpur , Malaysia
3. Department of Cardiology, National Heart Institute , 50400 Kuala Lumpur , Malaysia