[1] Cardiff Univ, Publ Hlth Dept Primary Care, Cardiff, S Glam, Wales
[2] Cardiff Univ, Publ Hlth Ctr Hlth Sci Res, Cardiff, S Glam, Wales
[3] Luton & Dunstable Hosp Trust, Luton, Beds, England
[4] Bedfordshire & Hertfordshire Hlth Protect Unit, Ampthill, England
[5] E England Hlth Protect Agcy, Cambridge, England
[6] TB Lead Ctr Infect Hlth Protect Agcy, London, England
[7] E England Training Scheme, Cambridge, England
[8] Bedfordshire & Hertfordshire Hlth Protect Unit, Welwyn Garden City, Herts, England