1 Division of Cardiology, Department of Emergency, Internal Medicine and Cardiology, S. Maria delle Croci Hospital, Ravenna, Italy, andrearubboli@libero.it.
2 Faculty of Medicine, University of Bologna - Campus of Ravenna, Ravenna, Italy, andrearubboli@libero.it.
3 Department of Cardiology, Oslo University Hospital Ullevål and Institute of Clinical Sciences, University of Oslo, Oslo, Norway.