1. Department of Obstetrics and Gynaecology, Croydon University Hospital
2. Department of Obstetrics and Gynaecology, Croydon University Hospital; Honorary senior lecturer, St George's University of London
3. Divisions of Maternal Fetal Medicine and Reproductive Sciences, Department of Obstetrics and Gynecology, University of Colorado Anschutz Medical Campus, USA
4. Department of Obstetrics and Gynaecology, Croydon University Hospital; Honorary reader, St George's University of London