1. Department of Clinical Epidemiology Aarhus University Hospital, Institute of Clinical Medicine, Aarhus University Aarhus Denmark
2. Department of Oral and Maxillofacial Surgery Rigshospitalet Copenhagen Denmark
3. Urology Department Karolinska University Hospital Stockholm Sweden
4. Department of Oral Surgery and Oral Medicine Faculty of Dentistry University of Oslo Oslo Norway
5. Division for Head, Neck and Reconstructive Surgery, Department of Otorhinolaryngology–Head and Neck Surgery Oslo University Hospital Oslo Norway
6. Department of Research Cancer Registry of Norway Oslo Norway
7. Department of Oral and Maxillofacial Surgery Skåne University Hospital Lund Sweden
8. Department of Biomaterials Sahlgrenska AcademyUniversity of Gothenburg Göteborg Sweden
9. Department of Oral and Maxillofacial Surgery Aarhus University Hospital Aarhus Denmark
10. Department of Dentistry and Oral Health Aarhus University Aarhus Denmark
11. Clinical Development, Amgen, Inc Thousand Oaks California
12. Center for Observational Research Amgen, Inc Thousand Oaks California