1. Nuffield Department of Women's & Reproductive Health University of Oxford Oxford UK
2. UK EQUATOR Centre, Centre for Statistics in Medicine, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences University of Oxford Oxford UK
3. Bodleian Health Care Libraries University of Oxford Oxford UK
4. Oxford Maternal & Perinatal Health Institute, Green Templeton College University of Oxford Oxford UK