1. The Royal Wolverhampton Hospitals NHS Trust; Department of Obstetrics and Gynaecology; New Cross Hospital Wednesfield Wolverhampton West Midlands UK WV10 0QP
2. Nottingham Health Science Partners; Nottingham Clinical Trials Unit; C Floor, South Block Queen's Medical Centre Nottingham UK NG7 2UH
3. University of Nottingham; Division of Child Health, Obstetrics and Gynaecology, School of Medicine; Nottingham City Hospital NHS Trust Hucknall Road Nottingham Nottinghamshire UK NG5 1PB
4. Ain Shams University; Department of Obstetrics and Gynaecology; Abbasia Square Cairo Egypt
5. New Cross Hospital, Royal Wolverhampton NHS Trust; Department of Obstetrics and Gynaecology; Wolverhampton Road Wolverhampton UK WV10 0QP