1. The Fertility Clinic, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
2. Section of Biostatistics, Department of Public Health, University of Copenhagen, Copenhagen, Denmark
3. The Fertility Clinic, Zealand University Hospital, Køge, Denmark
4. Department of Growth and Reproduction, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark
5. The Fertility Clinic, Herlev Hospital, Herlev, Denmark