[1] Southern Calif Permanente Med Grp, Dept Res & Evaluat, Pasadena, CA USA
[2] Kaiser Permanente Bernard J Tyson Sch Med, Dept Hlth Syst Sci, Pasadena, CA USA
[3] Kaiser Permanente Bernard J Tyson Sch Med, Dept Clin Sci, Pasadena, CA USA
[4] Kaiser Permanente West Los Angeles Med Ctr, Los Angeles, CA USA
[5] Southern Calif Permanente Med Grp, Qual & Clin Anal, Pasadena, CA USA
[6] Kaiser Permanente Bernard J Tyson Sch Med, Pasadena, CA USA
[7] Southern Calif Permanente Med Grp, Complete Care Support Programs, Reg SureNet, Pasadena, CA USA
[8] Kaiser Permanente Southern Calif, Dept Res & Evaluat, 100 S Los Robles Ave,2nd Floor, Pasadena, CA 91101 USA