What’s in a number?11Address reprint requests to: Centers for Disease Control and Prevention, National Immunization Program Resource Center, 1600 Clifton Road NE, Mailstop E-34, Atlanta, GA 30333. Fax: (404) 639-8828.

2001 ◽  
Vol 20 (4) ◽  
pp. 86-87 ◽  
Author(s):  
Diane M Simpson ◽  
Lance E Rodewald ◽  
Lawrence E Barker
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