1. Guy's and St Thomas' Hospital; Westimister Bridge Road London UK SE1 7EH
2. University of Auckland; Department of Obstetrics & Gynaecology; PO Box 92019 Auckland New Zealand 1003
3. Stepping Hill Hospital; Obstetric & Gynaecology ; 30 Badger Road Altrincham Cheshire UK WA14 5UZ
4. Tameside General Hospital; Tameside & Glossop Acute Services NHS Trust; Fountain Street Ashton-Under-Lyme Lancashire UK OL6 9RW