1. Department of Women's and Children's Health (T.B., M.O., J.H.), Uppsala University, S-751 85 Uppsala, Sweden
2. Carl von Linné Clinic (T.B., J.H.), Uppsala Science Park, S-751 83 Uppsala, Sweden
3. Uppsala Clinical Research Center (N.H., L.B.), S-751 85 Uppsala, Sweden
4. Centre for Reproductive Biology in Uppsala (J.H.), S-750 07 Uppsala, Sweden