1. Department of Otolaryngology, Henry Ford Hospital, Detroit, Michigan, USA
2. Department of Biostatistics, Henry Ford Health System, Detroit, Michigan, USA
3. Institute for Health Research, Kaiser Permanente Colorado, Denver, Colorado, USA
4. Kaiser Permanente Colorado, Denver, Colorado, USA
5. Geisinger Center for Health Research, Danville, Pennsylvania, USA
6. Kaiser Permanente Mid-Atlantic, Falls Church, Virginia, USA
7. Department of Head and Neck Surgical Oncology, Kaiser Permanente Southern California, San Diego, California, USA
8. Department of Research and Evaluation, Kaiser Permanente Southern California, Pasadena, California, USA
9. Essentia Institute of Rural Health, Duluth, Minnesota, USA