Cliodna A.M. McNulty* , Paul Boyle†, Tom Nichols‡, Douglas P. Clappison§, and Peter Davey¶
Author affiliations: *Health Protection Agency, Gloucester, United Kingdom; †University of Saint Andrews, Saint Andrews, United Kingdom; ‡Health Protection Agency, London, United Kingdom; §Southwold Surgery, Southwold, United Kingdom; ¶University of Dundee, Dundee, United Kingdom
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