1. Unit of Cancer Epidemiology, Scientific Institute of Public Health; Brussels Belgium
2. Department of Obstetrics and Gynecology; Reading Hospital; West Reading PA USA
3. Department of Obstetrics and Gynecology; Jefferson Medical College of Thomas Jefferson University; Philadelphia PA USA
4. Department of Internal Medicine; Reading Hospital; West Reading PA USA
5. Department of Internal Medicine; Jefferson Medical College of Thomas Jefferson University; Philadelphia PA USA