1. Epidemiology and Statistics Program, National Institute on Deafness and Other Communication Disorders (NIDCD), National Institutes of Health, Bethesda, Maryland, USA
2. Department of Otolaryngology and Division of Epidemiology, University of Minnesota, Minneapolis, Minnesota, USA
3. Division of Pediatric Otolaryngology, Children’s Hospital, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
4. Department of Otorhinolaryngology, Head & Neck Surgery, Rigshospitalet, University of Copenhagen, Denmark
5. Division of Mental Health, Norwegian Institute of Public Health (NIPH), Oslo, Norway
6. Faculty of Medicine Institute of Health and Society, Department of Health Management and Health Economics, University of Oslo, and Department of Research, Innovation and Education, Oslo University Hospital, Oslo, Norway
7. The Pediatric Physicians’ Organization at Children’s, Division of General Pediatrics, Children’s Hospital Boston, Boston, Massachusetts, USA