1. Section of Otolaryngology, Department of Surgery, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA.
2. Wisconsin Surgical Outcomes Research Program, Department of Surgery, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA.
3. Department of Radiology, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA.
4. Department of Surgery, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA.
5. Section of Endocrine Surgery, Department of Surgery, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA.