Canadian epidemiologists examine elective surgery.
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D002170:Canada; D002387:Cataract Extraction / Q000706:statistics & numerical data*; D017558:Elective Surgical Procedures / Q000706:statistics & numerical data*; D016021:Epidemiologic Studies; D006801:Humans; D016896:Treatment Outcome; D019564:Unnecessary Procedures / Q000706:statistics & numerical data*