1 Città di Lecce Hospital, GVM Care and Research, Prov.le per Arnesano Km 4, 73100 Lecce, Italy; Department of Cardiac Surgery, Paracelsus Medical University, Nuremberg, Germany. Electronic address: g.santarpino@libero.it.
2 Città di Lecce Hospital, GVM Care and Research, Lecce, Italy.
3 Department of Cardiac Surgery, University Hospital of Münster, Münster, Germany.