1. University of Michigan Medical School, Ann Arbor, MI, USA
2. University of Colorado, Aurora, CO, USA
3. New York University Grossman School of Medicine, New York, NY, USA
4. George Washington School of Medicine and Health Sciences, Washington, DC, USA
5. University of California Davis, Sacramento, CA, USA
6. Wake Forest University School of Medicine, Winston-Salem, NC, USA
7. Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA, USA