1. University of Michigan, Ann Arbor, Michigan, USA.
2. Winship Cancer Institute of Emory University, Atlanta, Georgia, USA.
3. New York University Grossman School of Medicine, New York, New York, USA.
4. John Hopkins University School of Medicine, Baltimore, Maryland, USA.
5. Vanderbilt University School of Medicine, Nashville, Tennessee, USA.
6. University of California San Francisco, San Francisco, California, USA.
7. Washington University in St. Louis School of Medicine, St. Louis, Missouri, USA.
8. University of Colorado Anschutz Medical Campus, Denver, Colorado, USA.