1. National Perinatal Epidemiology Unit, Nuffield Department of Population Health, University of Oxford, Oxford, UK
2. Shoklo Malaria Research Unit, Mahidol-Oxford Tropical Medicine Research Unit, Mae Sot, Thailand
3. Department of Family Medicine, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand
4. Primary Care, Population Sciences and Medical Education, University of Southampton, Southampton, UK
5. Department of Psychiatry, University of Oxford, Oxford, UK
6. Nuffield Department of Population Health, University of Oxford, Oxford, UK
7. Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand