Cancer diagnosis is one quarter lower than the expected cancer incidence in the first year of COVID‐19 pandemic in Germany: A retrospective register‐based cohort study oleh Johannes Diers, Laura Acar, Johanna C. Wagner, Philip Baum, Mohammed Hankir, Sven Flemming, Carolin Kastner, Christoph‐Thomas Germer, Helmut L'hoest2, Ursula Marschall, Johan Friso Lock, Armin Wiegering