1. Tufts Medical Center, Boston, Massachusetts, USA
2. Tufts University School of Medicine, Boston, Massachusetts, USA
3. Weill Cornell Medical College, New York, New York, USA
4. R. M. Alden Research Laboratory, Santa Monica, California, USA
5. Mayo Clinic, Rochester, Minnesota, USA
6. Virginia Commonwealth University Medical Center, Richmond, Virginia, USA
7. Hines VA Hospital, Hines, Illinois, USA
8. Loyola University Chicago, Maywood, Illinois, USA