Clinical Presentation of Pertussis in Unvaccinated and Vaccinated Children in the First Six Years of Life.
Tozzi, Alberto E.; Rava, Lucilla; Ciofi degli Atti, Marta L.; Salmaso, Stefania; Pediatrics, 2003, vol. 112, issue 5, p 1069, ISSN 00314005. ISBN 00314005.

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