1. Department of Vascular Surgery, Kanta-Häme Central Hospital, University of Turku, Hämeenlinna, Finland
2. Department of Otorhinolaryngology, Helsinki University Hospital, University of Helsinki, Helsinki, Finland
3. Department of Vascular Surgery, Helsinki University Hospital, Helsinki, Finland
4. Department of Vascular Surgery, Turku University Hospital, University of Turku, Turku, Finland