1. University of Colorado, Denver, CO;
2. University of Pennsylvania, Philadelphia, PA;
3. Mayo Clinic, Phoenix, AZ;
4. Mayo Clinic, Rochester, MN;
5. Alliance Statistics and Data Center, Mayo Clinic, Rochester, MN;
6. University of North Carolina at Chapel Hill, Chapel Hill, NC;
7. Section of Thoracic Surgery, Department of Surgery, Yale School of Medicine, New Haven, CT;
8. Yale University School of Medicine, New Haven, CT;
9. The Ohio State University Comprehensive Cancer Center, James Cancer Hospital, Solove Research Institute, Columbus, OH;
10. The Ohio State University Comprehensive Cancer Center, Arthur G. James Cancer Hospital, Columbus, OH;
11. University of California San Francisco, San Francisco, CA;
12. Memorial Sloan Kettering Cancer Center, New York, NY;