Rishma Maini, Katherine L. Henderson , Elizabeth A. Sheridan, Theresa Lamagni, Gordon Nichols, Valerie Delpech, and Nick Phin
Author affiliations: Author affiliations: Health Protection Agency, London, UK (R. Maini, K.L. Henderson, E.A. Sheridan, T. Lamagni, G. Nichols, V. Delpech, N. Phin); University of Chester, Chester, UK (N. Phin)
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