1. Warwick Medical School, University of Warwick, Coventry, England.
2. Centre for Applied Health Research and Delivery, Liverpool School of Tropical Medicine, Pembroke Place, Liverpool, L3 5QA, England.
3. Department of Business Management, Addis Ababa Science & Technology University, Addis Ababa, Ethiopia.
4. Health Economics and Epidemiology Research Office, University of Witwatersrand, Johannesburg, South Africa.
5. Medical Research Council Clinical Trials Unit at University College London, Institute of Clinical Trials & Methodology, London, England.
6. Department of Medicine, University of California San Francisco, San Francisco, United States of America (USA).
7. Division of Research and Development, Vital Strategies, New York, USA.