1. Department of Medicine, Faculty of Medicine and Allied Sciences, Rajarata University of Sri Lanka, Saliyapura, Sri Lanka.
2. Department of Virology II, National Institute of Infectious Diseases, Tokyo, Japan.
3. Military Hospital, Anuradhapura, Sri Lanka.
4. Department of Public Health, Sri Lanka Army Medical Services, Colombo, Sri Lanka.
5. Department of Community Medicine, Faculty of Medicine and Allied Sciences, Rajarata University of Sri Lanka, Saliyapura, Sri Lanka.