1. Diabetes, Obesity and Endocrinology Branch, National Institute of Diabetes and Digestive and Kidney Diseases, National Cancer Institute, National Institutes of Health, Bethesda, Maryland.
2. Endocrine Oncology Branch, National Cancer Institute, National Institutes of Health, Bethesda, Maryland.
3. Laboratory of Pathology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland.
4. Thoracic and Endocrine Surgery, University Hospitals of Geneva, Geneva, Switzerland.
5. Department of Surgery, The George Washington University School of Medicine and Health Sciences, Washington, District of Columbia.