title: Unexpected control-group behaviour in an intervention study.
authors.forename: S
authors.initials: S
authors.lastname: Anttila
authors.forename: M
authors.initials: M
authors.lastname: Isokoski
mesh_terms: D000368:Aged; D001519:Behavior; D002986:Clinical Trials as Topic / Q000379:methods*; D005260:Female; D006299:Health Services for the Aged / Q000706:statistics & numerical data; D006801:Humans; D008297:Male