1. Department of Otolaryngology, University of Colorado School of Medicine, Aurora, Colorado.
2. Department of Otorhinolaryngology, Head and Neck Surgery, University of Helsinki and Helsinki University Hospital, Helsinki, Finland.
3. Folkhälsan Institute of Genetics and Molecular Neurology Research Program, University of Helsinki, Helsinki, Finland.
4. Department of Biosciences and Nutrition, Karolinska Institutet, Huddinge, Sweden.