1. University of Colorado Health Sciences Center, Aurora, Colorado
2. The University of Texas Southwestern Medical Center at Dallas, Dallas
3. Baylor College of Medicine, Houston, Texas
4. The Mayo Clinic, Rochester, Minnesota
5. Vanderbilt University, Nashville, Tennessee
6. Merck Research Laboratories, Rahway, New Jersey
7. George Washington University, Bethesda, Maryland
8. National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland