1. Departments of Biomedical Engineering,
2. Cardiology, and
3. Pneumology, Fondazione S. Maugeri, Clinica del Lavoro e della Riabilitazione, IRCCS, Istituto Scientifico di Montescano, 27040 Montescano (PV), Italy; and
4. Cardiovascular Medicine, John Radcliffe Hospital, Oxford OX39DU, United Kingdom