1. Health and Social Care Unit, School of Public Health and Preventive Medicine, Monash University, 553 St Kilda Rd, Melbourne 3004, Australia
2. Independent Researcher, Henley-on-Thames RG9 1HG, UK
3. Department of Maternal and Fetal Medicine, Elizabeth Garrett Anderson Institute for Women’s Health, University College London, London WC1E 6HX, UK
4. Centre for Public Health, School of Medicine, Dentistry and Biomedical Sciences, Queen’s University Belfast, Belfast BT12 6BA, UK
5. Centre for Public Health, Bristol Medical School, University of Bristol, Canynge Hall, Whatley Road, Bristol BS8 2PN, UK
6. Department of Global Health and Social Medicine, Bush House, Strand Campus, King’s College London, 40 Aldwych, London WC2B 4BG, UK
7. Developmental Pathways for Health Research Unit, University of the Witwatersrand Faculty of Health Sciences, Johannesburg 2000, Gauteng, South Africa
8. Institute of Applied Health Research, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
9. Population Health Sciences Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne NE2 4AX, UK
10. Department of Obstetrics and Gynaecology, and Department of and Pediatrics, Erasmus MC, University Medical Center, 3015 GD Rotterdam, The Netherlands
11. School of Social Work, University of North Carolina at Chapel Hill, Pittsboro Road, Chapel Hill, NC 27599-3550, USA
12. Warwick Business School, University of Warwick, Scarman Rd, Coventry CV4 7AL, UK