1. Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Ho Chi Minh City, Viet Nam
2. Pham Ngoc Thach Hospital for Tuberculosis and Lung Diseases, Ho Chi Minh City, Viet Nam
3. Hospital for Tropical Diseases, Ho Chi Minh City, Viet Nam
4. Oxford University Clinical Research Unit, Hospital for Tropical Diseases, Ho Chi Minh City, Viet Nam; Centre for Clinical Vaccinology and Tropical Medicine, Churchill Hospital, Oxford, UK