[1] Westat Corp, Rockville, MD 20850 USA
[2] Helix, San Mateo, CA 94401 USA
[3] HealthPartners Inst, Minneapolis, MN USA
[4] Kaiser Permanente Ctr Hlth Res, Portland, OR USA
[5] Regenstrief Inst Hlth Care, Ctr Biomed Informat, Indianapolis, IN USA
[6] Indiana Univ, Sch Med, Indianapolis, IN USA
[7] Ctr Dis Control & Prevent, Coronavirus & Other Resp Viruses Div, Natl Ctr Immunizat & Resp Dis, Atlanta, GA USA
[8] Vanderbilt Univ, Med Ctr, Nashville, TN USA
[9] Baylor Scott & White Hlth, Temple, TX USA
[10] Texas A&M Univ, Coll Med, Temple, TX USA
[11] Columbia Univ, Irving Med Ctr, Dept Biomed Informat, New York, NY USA
[12] New York Presbyterian Hosp, New York, NY USA
[13] Univ Colorado, Sch Med, Anschutz Med Campus, Aurora, CO USA
[14] Intermt Healthcare, Div Infect Dis & Clin Epidemiol, Salt Lake City, UT USA
[15] Kaiser Permanente Northern Calif Div Res, Kaiser Permanente Vaccine Study Ctr, Oakland, CA USA
[16] Childrens Minnesota, Minneapolis, MN USA
[17] Indiana Univ, Fairbanks Sch Publ Hlth, Indianapolis, IN USA
[18] Ctr Dis Control & Prevent, Influenza Div, Natl Ctr Immunizat & Resp Dis, Atlanta, GA USA