DOI:
10.1055/s-00025477
International Archives of Otorhinolaryngology
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Referenz
Centers for Disease Control and Prevention.
National Immunization Survey (NIS)- Children (19–35 months): US vaccination coverage reported via NIS, January-December 2014.
http://www.cdc.gov/vaccines/imz-managers/coverage/nis/child/2014-released-child-teen.html . Accessed on February 1st 2016
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