1. Maxillofacial Unit in Linköping, and Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
2. Department of Hand Surgery, Plastic Surgery and Burns in Linköping, and Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
3. Department of Oral and Maxillofacial Surgery, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden