1. Department of Microbiology, Faculty of Medicine, University of Colombo, Colombo, Sri Lanka.
2. Department of Microbiology, Faculty of Medicine, Sabaragamuwa University of Sri Lanka, Ratnapura, Sri Lanka.
3. Sri Jayewardenepura General Hospital, Nugegoda, Sri Lanka.
4. Neville Fernando Teaching Hospital, Malabe, Sri Lanka.
5. Centre for Clinical Microbiology, Division of Infection and Immunity, University College London, Royal Free Campus, Rowland Hill Street, London, United Kingdom.