1 | Veterans Affairs Medical Center, Washington, DC, USA |
2 | George Washington University, Washington, DC, USA |
3 | Georgetown University, Washington, DC, USA |
4 | MedStar Washington Hospital Center, Washington, DC, USA |
5 | University of Alabama at Birmingham, Birmingham, AL, USA |
6 | University of California, Los Angeles, CA, USA |
7 | Weschester Medical Center, Valhalla, NY, USA |
8 | New York Medical College, Valhalla, NY, USA |