1. Geisel School of Medicine at Dartmouth, Hanover, New Hampshire
2. Faculty of Medicine and Health, Sydney School of Public Health, The University of Sydney, New South Wales, Australia
3. The University of Queensland Centre for Clinical Research, The University of Queensland, Herston, Australia
4. Department of Population Medicine, College of Medicine, Qatar University Health, Qatar University, Doha, Qatar
5. Wisconsin Surgical Outcomes Research and Division of Otolaryngology, Department of Surgery, University of Wisconsin, Madison
6. The VA Outcomes Group, US Department of Veterans Affairs Medical Center, White River Junction, Vermont
7. Section of Otolaryngology, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire
8. The Dartmouth Institute for Health Policy & Clinical Practice, Lebanon, New Hampshire