1. VA Outcomes Group, Department of Veterans Affairs Medical Center, White River Junction, Vermont.
2. Department of Surgery, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire.
3. Dartmouth Institute for Health Policy and Clinical Practice, Lebanon, New Hampshire.
4. University of Vermont College of Medicine, Burlington, Vermont.
5. Department of Radiology, Dartmouth Hitchcock Medical Center, Lebanon, New Hampshire.
6. Norris Cotton Cancer Center, Lebanon, New Hampshire.
7. Department of Medicine, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire.