1. Department of Medical Physics, School of Medicine, University of Patras, 26504 Patras, Greece
2. Department of Medical Physics, University Hospital of Patras, 26504 Patras, Greece
3. Department of Vascular Surgery, School of Medicine, University of Patras, 26504 Patras, Greece
4. Department of Vascular Surgery, University Hospital of Patras, 26504 Patras, Greece