1. Department of Cardiology University Hospital of Heraklion Heraklion Greece
2. Department of Neurosurgery, Unit of Cardiac Surgery University Hospital of Heraklion Heraklion Greece
3. Department of Cardiology Venizeleion General Hospital of Heraklion Heraklion Greece
4. Department of Neurosurgery Venizeleion General Hospital of Heraklion Heraklion Greece