1. The Fertility Clinic; Section 4071; Copenhagen University Hospital Rigshospitalet; Copenhagen Denmark
2. Department of Obstetrics and Gynaecology; The Fertility Clinic; Hvidovre Hospital; Hvidovre Denmark
3. Department of Biostatistics; University of Copenhagen; Copenhagen Denmark
4. Department of Gynaecology and Obstetrics; The Fertility Clinic; Holbaek Hospital; Holbaek Denmark