1. Whittall Street Clinic, Whittall Street, Birmingham B4 6DH, UK
2. Clinique Universitaire de Gynécologie-Obstétrique, Maternité Régionale de Nancy, France
3. Department of Obstetrics and Gynecology 537, Hvidovre Hospital, Kettegaards Alle 28, DK-2650 Hvidovre, Denmark