1. Liverpool School of Tropical Medicine, Liverpool, UK
2. Department of Learning, Informatics, Management and Ethics (LIME), Karolinska Institutet, Stockholm, Sweden
3. Oxford University Clinical Research Unit (OUCRU), Ho Chi Minh City 700000, Vietnam
4. Centre for Tropical Medicine and Global Health, Nuffield Department of Medicine, University of Oxford, Oxford OX3 7BN, UK
5. Health Economics and Financing Research, Health Systems and Population Studies Division, icddr, b, Dhaka, Bangladesh
6. Department of International Health, Johns Hopkins School of Public Health, USA
7. School of Public Health and Community Medicine, University of Gothenburg, Gothenburg, Sweden