1. Department of Oral and Maxillofacial Surgery, University Hospital, Linkoping, Sweden
2. Department of Prosthodontics, Centre of Oral Rehabilitation, Linköping, Sweden
3. Department of Oral and Maxillofacial Surgery, Vrinnevi Hospital, Norrköping, Sweden
4. Department of Prosthetic Dentistry, Institute of Postgraduate Dental Education, Jönköping, Sweden
5. Department of Oral and Maxillofacial Surgery, Public Health Service, Gävle Hospital, Gävle, Sweden
6. Department of Prosthodontics, Specialist Dental Centre, Norrköping, Sweden
7. Department of Oral and Maxillofacial Surgery, Institute of Postgraduate Dental Education, Jönköping, Sweden
8. Department of Oral and Maxillofacial Surgery, Kristianstad Hospital, Kristianstad, Sweden
9. Department of Prosthodontics, Public Dental Health, Kristianstad, Sweden