1 Division of Cardiology, MultiMedica Istituto di Ricovero e Cura a Carattere Scientifico (IRCCS), Milan.
2 Semi-Intensive Care Unit, Division of Pneumology, MultiMedica IRCCS, Milan.
3 Department of Computer, Modeling, Electronics and Systems Engineering, University of Bologna, Bologna.
4 Semi-Intensive Care Unit, Division of Pneumology, MultiMedica IRCCS, Milan, Department of Clinical Sciences and Community Health, Università di Milano, Milan, Italy.