[1] Guys Hosp, Kings Coll London, Canc Epidemiol Populat & Global Hlth, Res Oncol, 3rd Floor Bermondsey Wing, London SE1 9RT, England
[2] Queen Mary Univ London, Barts & London Sch Med & Dent, Ctr Canc Prevent, Wolfson Inst Prevent Med, Charterhouse Sq, London EC1M 6BQ, England
[3] Publ Hlth England, UK Natl Canc Anal & Registrat Serv, 2nd Floor Skipton House,80 London Rd, London SE1 6LH, England
[4] Aarhus Univ, Res Unit Gen Practice, Bartholins Alle 2, DK-8000 Aarhus C, Denmark
[5] Aarhus Univ, Res Ctr Canc Diag Primary Care CaP, Bartholins Alle 2, DK-8000 Aarhus C, Denmark
[6] Odense Univ Hosp, Dept Thorac Surg, Danish Lung Canc Registry, Sdr Blvd 29, DK-5000 Odense C, Denmark
[7] Karolinska Inst, Inst Mol Med & Kirurgi, Upper Gastrointestinal Res, Dept Mol Med & Surg MMK, K1,NS 67, S-17176 Stockholm, Sweden
[8] Liverpool Heart & Chest Hosp, Thomas Dr, Liverpool L14 3PE, Merseyside, England
[9] London Sch Hyg & Trop Med, Dept Med Stat, Keppel St, London WC1E 7HT, England