. Author manuscript; available in PMC: 2021 May 4.
Published in final edited form as: Med Image Anal. 2019 Feb 5;53:197–207. doi: 10.1016/j.media.2019.01.012
This manuscript version is made available under the CC-BY-NC-ND 4.0 license (http://creativecommons.org/licenses/by-nc-nd/4.0/)