[1] Kaiser Permanente Northern Calif, Vaccine Study Ctr, Div Res, 1 Kaiser Plaza,16th Floor, Oakland, CA 94612 USA
[2] Kaiser Permanente Southern Calif, Dept Res & Evaluat, Pasadena, CA USA
[3] Kaiser Permanente Bernard J Tyson Sch Med, Dept Hlth Syst Sci, Pasadena, CA USA
[4] HealthPartners Inst, Minneapolis, MN USA
[5] Harvard Med Sch, Dept Populat Med, Boston, MA 02115 USA
[6] Harvard Pilgrim Hlth Care Inst, Boston, MA USA
[7] Kaiser Permanente Northwest, Ctr Hlth Res, Portland, OR USA
[8] Marshfield Clin Res Inst, Ctr Clin Epidemiol & Populat Hlth, Marshfield, WI USA
[9] Kaiser Permanente Colorado, Inst Hlth Res, Denver, CO USA
[10] Kaiser Permanente Washington Hlth Res Inst, Seattle, WA USA
[11] Ctr Dis Control & Prevent, Immunizat Serv Div, Atlanta, GA USA
[12] Ctr Dis Control & Prevent, Immunizat Safety Off, Atlanta, GA USA