1. University of Newcastle; School of Medicine and Public Health; C/O Calvary Mater Newcastle Waratah NSW Australia 2294
2. University of Sydney; Department of Pharmacology; Blackburn Building D06 Sydney Medical School Camperdown NSW Australia 2006
3. University of Kelaniya; Department of Medicine; PO Box 6 Ragama Sri Lanka
4. Liverpool School of Tropical Medicine; Clinical Research Group; Pembroke Place Liverpool Merseyside UK L3 5QA