1. 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 (M.W.)
4. Kaiser Permanente Research Affiliates Evidence-based Practice Center and Kaiser Permanente Center for Health Research, Portland, Oregon (J.S.L.)