1. The Thyroid Center, Division of Endocrinology and Diabetes, Children’s Hospital of Philadelphia, Perelman School of Medicine, University of Pennsylvania, Philadelphia
2. VA Outcomes Group, Department of Veterans Affairs Medical Center, White River Junction, Vermont
3. The Section of Otolaryngology, Geisel School of Medicine at Dartmouth, the Dartmouth Institute for Health Policy and Clinical Practice, Hanover, New Hampshire