Whooping cough in school age children with persistent cough: prospective cohort study in primary care.
Harnden A; Grant C; Harrison T; Perera R; Brueggemann AB; Mayon-White R; Mant D; BMJ (Clinical Research Ed.), 2006, vol. 333, issue 7560, p 174, ISSN 17561833. ISBN 17561833.

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