1. Monash University; Department of Pharmacology; Victoria Australia
2. Faculty of Medicine, University of Peradeniya; Department of Biochemistry; Peradeniya Sri Lanka 24000
3. University of Sydney; Department of Pharmacology; Blackburn Building D06 Sydney Medical School Camperdown NSW Australia 2006
4. Liverpool School of Tropical Medicine; Clinical Research Group; Pembroke Place Liverpool Merseyside UK L3 5QA
5. University of Kelaniya; Department of Medicine; PO Box 6 Ragama Sri Lanka
6. University of Newcastle; School of Medicine and Public Health; Edith St Waratah New South Wales Australia 2298