1. State University of New York, Health Sciences Center, Brooklyn, New York, USA;
2. Mayo Clinic, Rochester, Minnesota, USA;
3. Beth Israel Deaconess Medical Center, Boston, Massachusetts, USA;
4. University of Virginia, Charlottesville, Virginia, USA;
5. Weill Cornell Medicine, New York, New York, USA;
6. University of Kentucky, Lexington, Kentucky, USA;
7. University of California, San Diego, San Diego, California, USA;
8. Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire, USA.