1. Division of Endocrinology, Department of Medicine, Washington Hospital Center, Washington, District of Columbia.
2. Department of Endocrinology and Diabetology, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University in Torun, Bydgoszcz, Poland.
3. Division of Gastroenterology, Washington Hospital Center, Washington, District of Columbia.
4. Division of Nuclear Medicine, Department of Medicine, Washington Hospital Center, Washington, District of Columbia.
5. Department of Medicine, Uniformed Services University of the Health Sciences, Bethesda, Maryland.
6. Department of Pediatrics, Uniformed Services University of the Health Sciences, Bethesda, Maryland.
7. Division of Thoracic Surgery, Department of Surgery, Washington Hospital Center, Washington, District of Columbia.
8. Department of Medicine, Washington Hospital Center, Washington, District of Columbia.