1. Johns Hopkins University, Baltimore, MD, USA
2. University of Southern California, Los Angeles, CA, USA
3. Mayo Clinic, Rochestor, MN, USA
4. Metro-Minnesota CCOP, Minneapolis, MN, USA
5. Washington University, St. Louis, MO, USA
6. Van Andel Research Institute, Grand Rapids, MI, USA
7. University of Pittsburgh, Pittsburgh, PA, USA
8. Mayo Clinic, Jacksonville, FL, USA