1. The Permanente Medical Group, Kaiser Permanente Northern California, Oakland, California (R.O., D.P.F., S.S.)
2. Kaiser Permanente Washington Health Research Institute, Seattle, Washington (E.J., M.K.T., J.A., D.A.)
3. Harvard T.H. Chan School of Public Health, Boston, Massachusetts (S.H.)
4. Kaiser Permanente Southern California, Pasadena, California (K.J.C.)
5. HealthPartners Institute, HealthPartners, Minneapolis, Minnesota (P.J.O.)
6. Kaiser Permanente Northern California, Oakland, California; RAND Corporation, Santa Monica, California (A.B.)
7. Institute for Health Research, Kaiser Permanente Colorado, Aurora, Colorado (E.B.S.)