Privacy-Preserving Federated Brain Tumour Segmentation - Li, Wenqi; Milletarì, Fausto; Xu, Daguang; Rieke, Nicola; Hancox, Jonny; Zhu, Wentao; Baust, Maximilian; Cheng, Yan; Ourselin, Sébastien; Cardoso, M. Jorge; Feng, Andrew (Machine Learning in Medical Imaging, 2019)