1. Neiman Health Policy Institute, Reston, VA, USA
2. Health Services Management, University of Minnesota, St. Paul, MN, USA
3. Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
4. Division of Diagnostic Imaging, The University of Texas MD Anderson Cancer Center, Houston, TX, USA
5. Department of Emergency Medicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
6. Department of Anesthesiology, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA