COVID-19, gender and estroprogestins, what do we know? - Fidecicchi, Tiziana (Department of Obstetrics and Gynecology. Pisa University Hospital of S. Chiara. Azienda Ospedaliera Universitaria) ; Fruzzetti, Franca (Department of Obstetrics and Gynecology. Pisa University Hospital of S. Chiara. Azienda Ospedaliera Universitaria) ; Lete Lasa, Luis Ignacio (Department of Obstetrics and Gynaecology. Araba University Hospital) ; Calaf Alsina, Joaquim (Institut d'Investigació Biomèdica Sant Pau) ; Universitat Autònoma de Barcelona