1. Section of General Internal Medicine, Department of Medicine, Boston University School of Medicine, Boston, Massachusetts, USA.
2. Department of Psychology, University of New Hampshire, Durham, New Hampshire, USA.
3. Department of Radiology, Boston University School of Medicine, Boston, Massachusetts, USA.
4. Department of Health Law, Policy, and Management, Boston University School of Public Health, Boston, Massachusetts, USA.
5. The Dartmouth Institute for Health Policy and Clinical Practice, Geisel School of Medicine, Dartmouth College, Hanover, New Hampshire, USA.