1. Department of Medicine, University of Patras, 26504 Rio, Greece
2. Department of Internal Medicine and Infectious Diseases, University General Hospital of Patras, 26504 Rio, Greece
3. Leto General, Maternity & Gynecology Clinic, 11524 Athens, Greece
4. Femicare, Clinical Research for Women, 3300 Tienen, Belgium
5. University Hospital Antwerpen, 2650 Antwerp, Belgium
6. Department of Obstetrics and Gynecology, Regional Hospital Heilig Hart, 3000 Tienen, Belgium