Published on in Vol 9, No 2 (2021): February
                                    Preprints (earlier versions) of this paper are
                                    available at
                                    https://preprints.jmir.org/preprint/22976, first published
                                    .
                                

1 Biomedical Informatics Group, School of Computer Science, Universidad Politecnica de Madrid, Madrid, Spain
2 Grupo de Redes de Neuronas Artificiales y Sistemas Adaptativos - Imagen Médica y Diagnóstico Radiológico, Department of Computer Science and Information Technologies, Faculty of Computer Science, University of A Coruña, A Coruña, Spain
