1. National Institute of Standards and Technology Boulder; Colorado USA
2. Duke University; Durham North Carolina USA
3. Northwestern University; Evanston Illinois USA
4. Cincinnati Children's Hospital Medical Center; Cincinnati Ohio USA
5. University of Michigan; Ann Arbor Michigan USA
6. National Institutes of Health; Bethesda Maryland USA
7. Merck Research Laboratories; West Point Pennsylvania USA
8. University of California; Los Angeles California USA
9. University of Cooperative Education Dresden; Dresden Germany
10. Mayo Clinic; Rochester Minnesota USA
11. King's College; London United Kingdom
12. University of Wisconsin; Madison Wisconsin USA
13. Toshiba Medical Research Institute; Mayfield Village Ohio USA
14. University of Washington; Seattle Washington USA
15. Washington University in St. Louis; St. Louis Missouri USA