Uncertainty for Safe Utilization of Machine Learning in Medical Imaging, and Perinatal Imaging, Placental and Preterm Image Analysis : 3rd International Workshop, UNSURE 2021, and 6th International Workshop, PIPPI 2021, Held in Conjunction with MICCAI 20 - Sudre, Carole H.; Abaci Turk, Esra; Baumgartner, Christian; Dalca, Adrian; Hutter, Jana; Licandro, Roxane; Melbourne, Andrew; Tanno, Ryutaro; Torrents Barrena, Jordina; Van Leemput, Koen (Springer International Publishing, 2021)