1. Biomedical Engineering Group (GIB), University of Valladolid, Paseo Belén 15, 47011, Valladolid, Spain
2. Cardiovascular Physics, Humboldt-Universität zu Berlin, Robert Koch Platz 4, 10115, Berlin, Germany
3. Center of Sleep Research, Charité Universitätsmedizin Berlin, Chariteplatz 1, 10117, Berlin, Germany
4. Department of Pneumology, Hospital Universitario Pío del Río Hortega, Dulzaina 2, 47013, Valladolid, Spain