[1] Minnesota Dept Hlth, Minneapolis, MN 55414 USA
[2] Kaiser Permanente, Vaccine Study Ctr, Oakland, CA USA
[3] US FDA, Div Biostat & Epidemiol, Rockville, MD 20857 USA
[4] Natl Ctr Infect Dis, Viral Gastroenteritis Sect, Resp & Enter Viruses Br, Atlanta, GA USA
[5] Natl Ctr Infect Dis, Off Director, Div Viral & Rickettsial Dis, Atlanta, GA USA
[6] CDC, Vaccine Safety Datalink Team, Atlanta, GA 30333 USA
[7] CDC, Stat Anal Br, Data Management Div, Atlanta, GA 30333 USA
[8] CDC, Vaccine Safety & Dev Activ, Atlanta, GA 30333 USA
[9] CDC, Child Vaccine Prevent Dis Br, Epidemiol & Surveillance Div, Natl Immunizat Program, Atlanta, GA 30333 USA