1. University of Nottingham; Nottingham Clinical Trials Unit; B39, Medical School Queen's Medical Centre Campus Nottingham UK NG7 2UH
2. North Middlesex University Hospital Foundation Trust; North Central Thames Foundation School; Sterling Way London UK N18 1QX
3. National Collaborating Centre for Women's & Children's Health; 4th Floor, King's Court 2-16 Goodge Street London UK W1T 2QA
4. Stellenbosch University and Tygerberg Hospital; Department of Obstetrics and Gynaecology, Faculty of Health Sciences; PO Box 19063 Tygerberg Western Cape South Africa 7505