[1] Ctr Dis Control & Prevent, Natl Immunizat Program, Epidemiol & Surveillance Div, Atlanta, GA 30333 USA
[2] Ctr Dis Control & Prevent, Natl Immunizat Program, Immunizat Serv Div, Atlanta, GA 30333 USA
[3] Ctr Dis Control & Prevent, Natl Immunizat Program, Off Director, Atlanta, GA 30333 USA