1. Medical Department, Sappasithiprasong Hospital, Ubon Ratchathani
2. Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand
3. Centre for Clinical Vaccinology and Tropical Medicine, Nuffield Department of Clinical Medicine, Churchill Hospital, University of Oxford, Oxford OX3 7LJ, United Kingdom
4. Menzies School of Health Research, Charles Darwin University and Northern Territory Clinical School, Flinders University, Darwin, Australia