1. Dana-Farber Cancer Institute, Boston, Massachusetts, USA
2. Alliance Statistics and Data Center, Mayo Clinic and Mayo Cancer Center, Rochester, Minnesota, USA
3. Mayo Clinic, Rochester, Minnesota, USA
4. City of Hope, Duarte, California, USA
5. University of North Carolina, Chapel Hill, North Carolina, USA
6. Duke University, Durham, North Carolina, USA
7. Queens Cancer Center of Queens Hospital, Jamaica, New York, USA