1. FHI 360, 359 Blackwell Street, Suite 200, Durham, NC 27701, USA and Department of Obstetrics and Gynaecology, University of North Carolina School of Medicine, Chapel Hill, NC, USA
2. James Lind Initiative, Summertown Pavilion, Middle Way, Oxford OX2 7LG, UK
3. Centre for Statistics in Medicine, University of Oxford, Nuffield Department of Orthopaedics, Rheumatology & Musculoskeletal Sciences, Botnar Research Centre, Oxford OX3 7LD, UK
4. Department of Obstetrics and Gynaecology, University of North Carolina School of Medicine, Chapel Hill, NC 27514, USA
5. Centre for Journalology, Clinical Epidemiology Program, Ottawa Hospital Research Institute, The Ottawa Hospital - General Campus, 501 Smyth Rd, Room L1288, Ottawa, ON, K1H 8L6, Canada
6. Department of Infectious Disease Epidemiology, London School of Hygiene & Tropical Medicine, Keppel Street, London WC1E 7HT, UK