Ending polio immunization: when and how are we sure that the needle is out of the haystack?

Author: Kimman T.G.   Koopmans M.P.G.   van der Avoort H.G.A.M.  

Publisher: Elsevier

ISSN: 0264-410X

Source: Vaccine, Vol.17, Iss.7, 1999-02, pp. : 624-627

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