1. Division of Endocrinology and Metabolism, Thyroid Section, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts, USA.
2. Department of Population Health Sciences, Durham, North Carolina, USA.
3. Department of Medicine, and Durham, North Carolina, USA.
4. Pacific Economic Research, LLC, Bellevue, Washington, USA.
5. Department of Surgery; Duke University Medical Center, Durham, North Carolina, USA.
6. Department of Surgery, University of California San Francisco-UCSF, San Francisco, California, USA.