1. Surgical Department L, Aarhus University Hospital, Aarhus, Denmark
2. The Danish Hernia Database, Department of Surgical Gastroenterology 435, Hvidovre Hospital, Hvidovre, Denmark
3. Surgical Department D, Glostrup Hospital, Glostrup, Denmark
4. Surgical Department, Nyborg Hospital, Nyborg, Denmark
5. Section for Surgical Pathophysiology 4074, The Juliane Marie Centre, Rigshospitalet, Copenhagen, Denmark