Surveillance of measles in England and Wales: implications of a national saliva testing programme.
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Ramsay, M., Brugha, R. & Brown, D. (1997). Surveillance of measles in England and Wales: implications of a national saliva testing programme.. Bulletin of the World Health Organization, 75 (6), 515 - 521. World Health Organization. https://iris.who.int/handle/10665/264300