title: NaTHNaC-the National Travel Health Network and Centre (England).
authors.affiliation: NaTHNaC, National Travel Health Network and Centre, UCLH-Hospital for Tropical Diseases, Mortimer Market Centre, Capper Street, London WC1E 6AU, UK.
authors.forename: Nick J
authors.initials: NJ
authors.lastname: Beeching
authors.forename: David R
authors.initials: DR
authors.lastname: Hill