Affiliation: | 1. Department of Public Health, Clinicum, University of Helsinki, P.O. Box 20, 00014 University of Helsinki, Helsinki, Finland;2. Department of Biosciences, University of Helsinki, P.O. Box 65, 00014 University of Helsinki, Helsinki, Finland;3. Fertilitetscentrum Stockholm, Storängsvägen 10, 11541 Stockholm, Sweden |