1. Research Unit for General Practice in the North Denmark Region and Department of Clinical Medicine, Aalborg University, Aalborg, Denmark.
2. Public Health and Quality Improvement, Central Denmark Region, Denmark.
3. Surgical Research Unit, Department of Surgery, Regional Hospital Herning, Herning, Denmark.
4. Vascular Surgical Research Unit, Department of Vascular Surgery, Regional Hospital Viborg, Viborg, Denmark.