1. Department of Clinical Medicine, Faculty of Medicine, University of Colombo, Colombo, Sri Lanka;
2. Department of Pathology, Faculty of Medicine, University of Colombo, Colombo, Sri Lanka;
3. Department of Medicine and South Asian Clinical Toxicology Research Collaboration, Faculty of Medicine, University of Peradeniya, Peradeniya, Sri Lanka;
4. Department of Physiology, Faculty of Medicine, University of Colombo, Colombo, Sri Lanka;
5. Clinical Toxicology Research Group, University of Newcastle, Newcastle, New South Wales, Australia;
6. South Asian Clinical Toxicology Research Collaboration, Faculty of Medicine, University of Peradeniya, Peradeniya, Sri Lanka