Health Protection Agency (HPA),
Documents of the Health Protection Agency, RCE-1: 1-180, ISBN 978-0-85951-573-3
2004,
Clements-Croome D, Adey R, Smith C, Martin A, Hyland G, Chadwick P, Sienkiewicz Z, Havas M, Moldan D, Phillips A, Monro J, Silk A, Henshaw D, Michael B, Hand J, Cherry N, Smallwood J, Johannson O, Binhi V, Preece A, Speare-Cole A, Kemp R, Dolan M, Hughes N, Lang S, Smith M, Grainger P, Levitt BB