[1] Kaiser Permanente Southern Calif, Dept Res & Evaluat, Pasadena, CA USA
[2] Kaiser Permanente Los Angeles Med Ctr, Los Angeles, CA USA
[3] Kaiser Permanente Southern Calif, Reg Clin Operat, Pasadena, CA USA
[4] Kaiser Permanente Southern Calif, Dept Res & Evaluat, 100 S Los Robles Ave,2nd Floor, Pasadena, CA 91101 USA