[1] Oxford University Clinical Research Unit,Wellcome Trust Major Overseas Programme
[2] Hospital for Tropical Diseases,Department of Clinical Sciences
[3] Liverpool School of Tropical Medicine,Nuffield Department of Clinical Medicine
[4] Centre for Tropical Medicine,Department of Medical Microbiology
[5] Churchill Hospital,undefined
[6] Hospital for Tropical Diseases,undefined
[7] Dong Thap Provincial Hospital,undefined
[8] Dong Thap Province,undefined
[9] University of East Anglia,undefined
[10] London School of Hygiene and Tropical Medicine,undefined