[1] CDC, Natl Ctr Immunizat & Resp Dis, Influenza Div, Atlanta, GA 30333 USA
[2] CDC, Epidem Intelligence Serv, Geneva, Switzerland
[3] Vanderbilt Univ, Med Ctr, Nashville, TN USA
[4] Yale Univ, New Haven, CT USA
[5] Intermt Med Ctr, Salt Lake City, UT USA
[6] Wake Forest Univ, Bowman Gray Sch Med, Winston Salem, NC USA
[7] Ohio State Univ, Wexner Med Ctr, Columbus, OH USA
[8] Univ Michigan, Sch Med, Ann Arbor, MI USA
[9] Westat Corp, Clin Res Practice, Rockville, MD USA
[10] HealthPartners Inst, Minneapolis, MN USA
[11] Kaiser Permanente Southern Calif, Dept Res & Evaluat, Pasadena, CA USA
[12] Intermt Hlth, Div Infect Dis & Clin Epidemiol, Salt Lake City, UT USA
[13] Kaiser Permanente Ctr Hlth Res, Sci Programs Dept, Portland, OR USA
[14] Kaiser Permanente Northern Calif Div Res, Kaiser Permanente Vaccine Study Ctr, Oakland, CA USA
[15] Ctr Biomed Informat, Regenstrief Inst, Indianapolis, IN USA
[16] Indiana Univ, Fairbanks Sch Publ Hlth, Indianapolis, IN USA
[17] Univ Colorado, Dept Biomed Informat, Anschutz Med Campus, Aurora, CO USA
[18] Henry Ford Hlth, Dept Publ Hlth Sci, Detroit, MI USA
[19] Washington Univ, Sch Med, Dept Emergency Med, St Louis, MO USA
[20] Univ Hosp Cleveland, Dept Emergency Med, Cleveland, OH USA
[21] Univ Pittsburgh, Dept Family Med, Pittsburgh, PA USA
[22] Baylor Scott & White Hlth, Dept Pediat, Temple, TX USA
[23] Baylor Coll Med, Dept Pediat, Temple, TX USA
[24] Kaiser Permanente Washington Hlth Res Inst, Seattle, WA USA
[25] Kaiser Permanente Bernard J Tyson Sch Med, Pasadena, CA USA
[26] Arizona State Univ, Biodesign Ctr Personalized Diagnost, Tempe, AZ USA
[27] Duke Univ, Sch Med, Duke Human Vaccine Inst, Durham, NC USA
[28] Univ Missouri Kansas City, Sch Med, Kansas City, MO USA
[29] Childrens Mercy Hosp, Kansas City, MO USA
[30] Univ Rochester, Sch Med & Dent, Rochester, NY USA
[31] Cincinnati Childrens Hosp Med Ctr, Cincinnati, OH USA
[32] Univ Cincinnati, Coll Med, Cincinnati, OH USA
[33] Texas Childrens Hosp, Houston, TX USA
[34] Baylor Coll Med, Houston, TX USA
[35] Univ Pittsburgh, Sch Med, UPMC Childrens Hosp Pittsburgh, Pittsburgh, PA USA
[36] Seattle Childrens Res Inst, Seattle, WA USA
[37] CDC, Natl Ctr Immunizat & Resp Dis, Coronavirus & Other Resp Viruses Div, Atlanta, GA USA