1. Memorial Sloan Kettering Cancer Center, New York, New York, USA
2. Weill Cornell Medical College, New York, New York, USA
3. Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA
4. University of Rochester, Rochester, New York, USA
5. University of Kansas Medical Center, Kansas City, Kansas, USA
6. John Theurer Cancer Center Hackensack UMC, Hackensack, New Jersey, USA
7. University of Cincinnati, Cincinnati, Ohio, USA
8. University of Chicago, Chicago, Illinois, USA
9. Acceleron Pharma, Cambridge, Massachusetts, USA