1. The VA Outcomes Group, White River Junction Veterans Affairs Medical Center, White River Junction, Vermont, and Geisel School of Medicine at Dartmouth and Dartmouth Institute for Health Policy and Clinical Practice, Lebanon, New Hampshire (L.D.)
2. University of Arizona College of Medicine–Phoenix, Phoenix, Arizona (D.B.P.)
3. Abt Associates, Cambridge, Massachusetts (L.M., M.W.)
4. Kaiser Permanente Research Affiliates Evidence-based Practice Center, Kaiser Permanente Center for Health Research, Portland, Oregon (J.S.L.)