1. Department of Clinical Sciences/Otorhinolaryngology; Umeå University; Umeå Sweden
2. Department of Surgical and Perioperative Sciences/Surgery; Umeå University; Umeå Sweden
3. Department of Odontology/Oral and Maxillofacial Radiology; Umeå University; Umeå Sweden
4. Department of Umeå School of Business and Economics/Statistics; Umeå University; Umeå Sweden
5. Department of Public Health and Clinical Medicine/Epidemiology and Global Health; Umeå University; Umeå Sweden
6. Department of Public Health and Clinical Medicine/Medicine; Umeå University; Umeå Sweden