1. Department of Physiology, Faculty of Medicine, University of Peradeniya, Peradeniya, Sri Lanka
2. Department of Physiology, Faculty of Medicine and Allied Health Sciences, Rajarata University of Sri Lanka, Saliyapura, Sri Lanka
3. Department of Psychiatry, Faculty of Medicine, University of Kelaniya, Ragama, Sri Lanka
4. Department of Psychiatry, Faculty of Medicine, University of Peradeniya, Peradeniya, Sri Lanka