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Helsinki Univ Hosp, Helsinki, Finland
Univ Helsinki, Folkhalsan Res Ctr, Helsinki 00014, Finland
Natl Inst Hlth & Welf, Dept Chron Dis Prevent, Helsinki, Finland
Univ Helsinki, Unit Gen Practice & Primary Hlth Care, Helsinki, Finland Univ Helsinki, Dept Obstet & Gynecol, Helsinki 00014, Finland