1. Department of Surgical Sciences, Uppsala University , Uppsala , Sweden
2. Department of Plastic and Craniofacial Surgery, Karolinska University Hospital , Stockholm , Sweden
3. Department of Surgery, Sahlgrenska University Hospital, Institute of Clinical Sciences, Sahlgrenska Academy at Gothenburg University , Gothenburg , Sweden
4. Department of Surgery, Capio S:t Göran’s Hospital , Stockholm , Sweden
5. Departement of Medicine and Surgery, Karolinska Intitutet , Stockholm , Sweden
6. Department of Surgery and Perioperative Sciences, Umeå University , Umeå , Sweden
7. Department of Surgery, University of Helsinki and Helsinki University Hospital , Helsinki , Finland
8. Department of Surgery, Halland Hospital , Halmstad , Sweden
9. Department of Clinical Sciences, Lund University , Lund , Sweden
10. Department of Plastic Surgery, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg , Gothenburg , Sweden
11. Department of Plastic and Reconstructive Surgery, Region Västra Götaland, Sahlgrenska University Hospital , Gothenburg , Sweden
12. Sveastat AB , Göteborg , Sweden
13. Department of Plastic and Reconstructive Surgery, Uppsala University Hospital , Uppsala , Sweden