1. First University Clinic of Obstetrics and Gynaecology, Aristotle University of Thessaloniki, Hippokrateion Hospital, Thessaloniki, Greece
2. Pathology Department, Hospital Universitari de Bellvitge, Spain
3. Servei d'Epidemiologia i Registre del Càncer, Institut Catalá d'Oncologia, L'Hospitalet, Spain
4. Roche Molecular Systems Inc, Alameda, California, USA