1. Division of Infectious Disease, University Medicine Cluster, National University Hospital, Singapore
2. Department of Medicine, National University of Singapore, Singapore
3. Mahidol-Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Salaya, Thailand
4. Nuffield Department of Medicine, University of Oxford, Oxford, England
5. Department of Internal Medicine, Carver College of Medicine, University of Iowa, Iowa City
6. Center for Access and Delivery Research and Evaluation, Iowa City VA Health Care System, Iowa City, Iowa