1. The University of North Texas Health Science Center, Fort Worth, Texas
2. Wilford Hall Medical Center, Lackland Air Force Base, San Antonio, Texas
3. The Heart & Vascular Institute of Texas, San Antonio, Texas
4. Brooks Air Force Base, San Antonio
5. Merck & Co., Inc., West Point, Pennsylvania
6. Medical Research Laboratories, Highland Heights, Kentucky
7. Weill Medical College of Cornell University, New York, New York