1. Division of Internal Medicine and Hypertension, Department of Medical Sciences, University of Torino, Torino, Italy
2. Department of Mathematical Sciences G. L. Lagrange, Polytechnic University of Torino, Torino, Italy
3. Department of Electrical, Electronic and Information Engineering “Guglielmo Marconi” (DEI), University of Bologna, Bologna, Italy
4. Medizinische Klinik und Poliklinik IV, Klinikum der Universität, Ludwig-Maximilians-Universität München, Munich, Germany