Disturbances of menstrual cycle after immunization against SARS-CoV-2 and their risk factors: Cross-sectional clinical study. - Lukac S; Hancke K; Janni W; Gruber T; Schmid M; El-Taie Z; Kersten M; Friedl TWP; Dayan D (International journal of gynaecology and obstetrics: the official organ of the International Federation of Gynaecology and Obstetrics, 2023)