1. Department of Surgery D; Herlev Hospital; University of Copenhagen; DK-2730 Herlev Denmark
2. Multidisciplinary Pain Center 7612; Neuroscience Center; Rigshospitalet; DK-2100 Copenhagen Denmark
3. Department of Neuroscience and Pharmacology; University of Copenhagen; DK-2100 Copenhagen Denmark
4. Department of Surgery; Roskilde and K; ø; ge Hospital; University of Copenhagen; DK-4000 Roskilde Denmark