1. Department of Physiology, Faculty of Medicine, University of Peradeniya, Peradeniya, Sri Lanka
2. Faculty of Medicine and Allied Health Sciences, Department of Physiology, Rajarata University of Sri Lanka, Saliyapura, Sri Lanka
3. Faculty of Medicine, Department of Psychiatry, University of Peradeniya, Peradeniya, Sri Lanka
4. Faculty of Medicine, Department of Psychiatry, University of Kelaniya, Ragama, Sri Lanka
5. Queen Square Institute of Neurology, University College London, London, UK