1. Wake Forest School of Medicine, Winston-Salem, NC, USA
2. Dana-Farber Cancer Institute, Boston, MA, USA
3. University of Tennessee Health Science Center, Memphis, USA
4. Harvard Medical School, Boston, MA, USA
5. Cambridge Health Alliance, Cambridge, MA, USA
6. University of Rochester School of Medicine and Dentistry and Department of Epidemiology, NY, USA
7. University of Iowa College of Public Health, Rochester, NY, USA
8. University of Massachusetts Medical School, Worcester, USA
9. Vanderbilt University Medical Center, Nashville, USA