Cancer in children born after frozen-thawed embryo transfer: A cohort study. oleh Nona Sargisian, Birgitta Lannering, Max Petzold, Signe Opdahl, Mika Gissler, Anja Pinborg, Anna-Karina Aaris Henningsen, Aila Tiitinen, Liv Bente Romundstad, Anne Lærke Spangmose, Christina Bergh, Ulla-Britt Wennerholm