1. Department of Biochemistry, Universiti Kebangsaan Malaysia Medical Center Jalan Yaacob Latif, Kuala Lumpur, Malaysia;
2. Faculty of Medicine and Health Sciences, Universiti Sains Islam Malaysia, Kuala Lumpur, Malaysia;
3. Department of Psychiatry, Universiti Kebangsaan Malaysia Medical Center, Kuala Lumpur, Malaysia;
4. Faculty of Medicine, Universiti Teknologi Mara, Jalan Hospital, 47000 Sungai Buloh, Malaysia