1. FHI 360; Clinical Sciences; P.O. Box 13950 Research Triangle Park North Carolina USA 27709
2. Leiden University Medical Center; Department of Medical Psychology; PO Box 9600 Leiden Netherlands 2300 RC
3. Leiden University Medical Center; Department of Gynaecology, Division of Reproductive Medicine and Dept. of Clinical Epidemiology; PO Box 9600 Albinusdreef 2 Leiden Netherlands NL 2300 RC