1. University of Alabama at Birmingham, Birmingham, Alabama
2. Loyola University Chicago, Chicago, Illinois
3. New England Research Institutes, Watertown, Massachusetts
4. University of Pittsburgh, Magee-Womens Hospital, Pittsburgh, Pennsylvania
5. University of Utah, Salt Lake City, Utah
6. William Beaumont Hospital, Royal Oak, Michigan
7. University of Texas at San Antonio, San Antonio
8. University of Maryland, Baltimore
9. University of Texas, Southwestern, Dallas, Texas
10. Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire
11. National Institute of Diabetes and Digestive and Kidney Diseases, Bethesda, Maryland
12. University of California, San Diego, La Jolla, California