1 Department of Cardiology, HM University Hospital Sanchinarro, Madrid, Spain.
2 Department of Cardiology and Cardiac Surgery, University of Navarra Clinic, University of Navarra, Pamplona, Spain.
3 Research Support Service, Central Clinical Trials Unit, University of Navarra Clinic, University of Navarra, Avenida Pío XII 36, 31008, Pamplona, Spain. jorge.nun@gmail.com.