1. Department of Surgery, Section of Endocrine Surgery, Duke University School of Medicine, Duke Raleigh Hospital, Raleigh, North Carolina.
2. Department of Surgery, Division of Endocrine Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.
3. Department of Surgery, University of Toledo, Toledo, Ohio.
4. Department of Surgery, Division of Surgical Oncology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania.