1 Department of Biostatistics, Epidemiology, and Informatics, Institute for Biomedical Informatics, University of Pennsylvania, Perelman School of Medicine, Philadelphia, PA, 19104 USA.
2 Department of Electrical, Computer and Biomedical Engineering University of Pavia, Pavia, Italy. Electronic address: lucia.sacchi@unipv.it.
3 Department of Electrical, Computer and Biomedical Engineering University of Pavia, Pavia, Italy.
4 Division of Informatics, Imaging, and Data Science, The University of Manchester, Manchester Academic Health Science Centre, Manchester, UK.