Belén Provenzano-Castro1, Silvia Oizerovich2, Babill Stray-Pedersen3. 1. Department of OB-GYN, Gynaecology Division, Faculty of Medicine, University of Buenos Aires, Ciudad de Buenos Aires, Argentina; Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Norway. Electronic address: belenprov@hotmail.com. 2. Department of OB-GYN, Gynaecology Division, Faculty of Medicine, University of Buenos Aires, Ciudad de Buenos Aires, Argentina. 3. Institute of Clinical Medicine, Faculty of Medicine, University of Oslo, Norway; Division of Women, Rikshospitalet, Oslo University Clinic, Norway.