[1] Univ Helsinki, Dept Publ Hlth, Fac Med, FIN-00014 Helsinki, Finland
[2] Natl Inst Hlth & Welf, Dept Hlth Promot & Chron Dis Prevent, Helsinki, Finland
[3] Pennington Biomed Res Ctr, Chron Dis Epidemiol Lab, Baton Rouge, LA USA
[4] Inst Stat & Epidemiol Canc Res, Finnish Canc Registry, Helsinki, Finland
[5] Univ Tampere, Sch Publ Hlth, FIN-33101 Tampere, Finland
[6] S Ostrobothnia Cent Hosp, Seinajoki, Finland
[7] Danube Univ Krems, Dept Clin & Prevent Med, Krems, Austria