1. Vascular Surgery Department, Pauls Stradins Clinical University Hospital, Riga Stradins University, LV-1002 Riga, Latvia
2. Vascular Surgery Department, Pauls Stradins Clinical University Hospital, University of Latvia, LV-1002 Riga, Latvia
3. Diagnostic and Interventional Radiology Centre, Pauls Stradins Clinical University Hospital, LV-1002 Riga, Latvia
4. Statistics Laboratory, Riga Stradins University, LV-1002 Riga, Latvia
5. Faculty of Medicine and Health Sciences, McGill University, Montreal, QC H3A 0G4, Canada
6. General Surgery Department, Pauls Stradins Clinical University Hospital, Riga Stradins University, LV-1002 Riga, Latvia
7. Department of Surgery, Stanford University Medical Center, Stanford, CA 94305, USA