1. Clinical Research Center of North Texas, Denton, Texas.
2. Cedars-Sinai Medical Center/University of California, Los Angeles, California.
3. Vanderbilt University, Nashville, Tennessee.
4. Planned Parenthood of Arkansas and Eastern Oklahoma Inc., Tulsa, Oklahoma.
5. University of Medicine and Dentistry of New Jersey-Robert Wood Johnson Medical School, New Brunswick, New Jersey.
6. Roche, Nutley, New Jersey.
7. Washington University, St. Louis, Missouri.