1. Department d’Enginyeria Mecànica, Universitat Rovira i Virgili, Tarragona, Spain (S.C., J.P.).
2. Cardiology Department, Cleveland Clinic, Cleveland, OH (R.P.).
3. Cardiology Department, Germans Trias i Pujol University Hospital, Badalona, Barcelona, Spain (O.A.-J.A., A.B.-G.).