1. Wellcome Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
2. Nuffield Department of Clinical Medicine, Oxford University, John Radcliffe Hospital, Headington, Oxford, U.K.
3. Department of Medicine, University of Western Australia, Fremantle Hospital, Fremantle, Western Australia, Australia
4. Department of Medicine, Paholpolpayuhasena Hospital, Kanchanaburi, Thailand
5. University Department of Medicine, Royal Perth Hospital, Perth, Western Australia, Australia