1. Department of Physiology, Faculty of Medicine, University of Peradeniya, Peradeniya 20400, Sri Lanka
2. Department of Physiology, Faculty of Medicine and Allied Health Sciences, Rajarata University of Sri Lanka, Saliyapura 50008, Sri Lanka
3. Department of Psychiatry, Faculty of Medicine, University of Peradeniya, Peradeniya 20400, Sri Lanka