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Natl Inst Hlth & Welf, Dept Hlth, Chron Dis Prevent Unit, POB 310, Oulu 90101, Finland
Natl Inst Hlth & Welf, Dept Hlth, Chron Dis Prevent Unit, Helsinki, Finland
Univ Oulu, Fac Med, Inst Hlth Sci, Oulu, Finland
Oulu Univ Hosp, Med Res Ctr Oulu, Dept Pediat & Adolescence, Oulu, Finland Natl Inst Hlth & Welf, Dept Hlth, Chron Dis Prevent Unit, POB 310, Oulu 90101, Finland