1. Laboratory of Reproductive Biology, Section 5712, The Juliane Marie Centre for Women, Children and Reproduction, University Hospital of Copenhagen, Faculty of Health and Medicine, University of Copenhagen, Rigshospitalet, Blegdamsvej 9, Copenhagen N, Denmark
2. Reproductive Medicine Unit, Herlev-Gentofte Hospital, Herlev Ringvej 75, Herlev, Denmark
3. Fertility Clinic, Skive Regional Hospital, Resenvej 25, Skive, Denmark
4. Department of Clinical Medicine, Aarhus University, Palle Juul-Jensens Boulevard 82, Aarhus N, Denmark