Biomedical image registration, domain generalisation and out-of-distribution analysis MICCAI 2021 challenges: MIDOG 2021, MOOD 2021, and Learn2Reg 2021, held in conjunction with MICCAI 2021, Strasbourg, France, September 27 - October 1, 2021 : proceedings - Aubreville, Marc 1982- (Lecture notes in computer science, 2022)