1. Department of Oral Microbiology and Immunology; Institute of Odontology, Sahlgrenska Academy, University of Gothenburg; Gothenburg Sweden
2. Department of Oral Prosthetics; Institute of Odontology, Sahlgrenska Academy, University of Gothenburg; Gothenburg Sweden
3. Department of Oral and Maxillofacial Surgery; Institute of Odontology, Sahlgrenska Academy, University of Gothenburg; Gothenburg Sweden
4. Department of Otolaryngology; Head and Neck Surgery, Sahlgrenska Academy, University of Gothenburg, Sahlgrenska University Hospital; Gothenburg Sweden