1. Division of Otolaryngology–Head & Neck Surgery, Department of Surgery, University of Utah, Salt Lake City
2. Comparative Effectiveness, Cost and Outcomes Research Center, University of Washington, Seattle
3. Pharmaceutical Outcomes Research and Policy Program, School of Pharmacy, University of Washington, Seattle
4. Department of Otolaryngology–Head and Neck Surgery, University of Washington, Seattle
5. Surgery Service, Veterans Affairs Puget Sound Health Care System, Seattle, Washington