1 Cardiovascular Research Institute Basel (CRIB) and Department of Cardiology, University Hospital Basel, University of Basel, Basel, Switzerland.
2 University of Pisa and University Cardiology Division, Pisa University Hospital, Pisa, Italy; Fondazione VillaSerena per la Ricerca, Città Sant'Angelo, Pescara, Italy.
3 Cardiovascular Research Institute Basel (CRIB) and Department of Cardiology, University Hospital Basel, University of Basel, Basel, Switzerland. Electronic address: christian.mueller@usb.ch.