1. Duke Univ, Durham, NC
2. Wake Forest Baptist Med Cntr, Winston Salem, NC
3. Duke Clinical Rsch Institute, Durham, NC
4. Univ of California, Los Angeles, Los Angeles, CA
5. Duke Univ Med Cntr, Durham, NC
6. Univ of North Carolina Wilmington, Wilmington, NC
7. Duke Regional Hosp, Durham, NC
8. Columbia Univ College of Physicians and Surgeons, New York, NY
9. Massachusetts General Hosp, Boston, MA