[1] Social Insurance Inst, Res Dept, Helsinki 0010, Finland
[2] Univ Tampere, Sch Med, Natl Res & Dev Ctr Welf & Hlth, Finnish Off Hlth Care Technol Assessment, Tampere 33014, Finland
[3] Univ Helsinki, Dept Publ Hlth, Helsinki 00014, Finland
[4] Natl Res & Dev Ctr Welf & Hlth, Finnish Off Hlth Care Technol Assessment, Helsinki 00531, Finland
[5] Kemi Hlth Ctr, Simo 95200, Finland
[6] Univ Tampere, Sch Publ Hlth, FIN-33101 Tampere, Finland
[7] Univ Tampere, Sch Med, Natl Publ Hlth Inst, Dept Inflammat & Microbial Ecol, Tampere 33014, Finland
[8] Natl Publ Hlth Inst, Dept Inflammat & Microbial Ecol, Turku 20520, Finland
[9] Social Insurance Inst, Helsinki 00101, Finland
[10] Natl Agcy Med, Helsinki 00301, Finland
[11] Helsinki & Uusimaa Hosp Dist, Grp Adm, Helsinki 00029, Finland
[12] Paijat Hame Cent Hosp, Dept Clin Microbiol, Med Serv Div, Lahti 15850, Finland
[13] Finnish Inst Occupat Hlth, Helsinki 00250, Finland
[14] Finnish Med Soc Duodecim, Helsinki, Finland