1. Pacific Northwest Evidence-based Practice Center, Department of Medical Informatics and Clinical Epidemiology, and Departments of Family Medicine and Obstetrics and Gynecology, Oregon Health & Science University, Portland, Oregon (A.G.C.)
2. Department of Health Systems Science, Kaiser Permanente Bernard J. Tyson School of Medicine, Pasadena, California (H.D.N.)
3. Pacific Northwest Evidence-based Practice Center, Department of Medical Informatics and Clinical Epidemiology, Oregon Health & Science University, Portland, Oregon (M.P., C.A.).