1. The Royal Wolverhampton Hospitals NHS Trust; Department of Obstetrics and Gynaecology; New Cross Hospital Wednesfield Wolverhampton West Midlands UK WV10 0QP
2. City Hospital, Birmingham; Department of Medicine; Dudley Road Birmingham UK B18 7QH
3. The University of Liverpool; School of Reproductive and Developmental Medicine, Division of Perinatal and Reproductive Medicine; First Floor, Liverpool Women's NHS Foundation Trust Crown Street Liverpool UK L8 7SS
4. Good Hope Hospital NHS Trust; Department of Obstetrics and Gynaecology; Rectory Road Sutton Coldfield West Midlands UK B75 7RR