[1] Natl Publ Hlth Inst, Dept Infect Dis Epidemiol, Helsinki, Finland
[2] Natl Publ Hlth Inst, Enter Bacteria Lab, Dept Bacterial & Inflammatory Dis, Helsinki, Finland
[3] Natl Agcy Med, Helsinki, Finland
[4] Hosp Dist Helsinki & Uusimaa, Helsinki, Finland
[5] Municipal Hlth Ctr, Vantaa, Finland
[6] Antioxidant Private Clin, Helsinki, Finland