title: Performance indicators. How valid are the indicators?
authors.forename: G A
authors.initials: GA
authors.lastname: Gooiker
authors.forename: R A E M
authors.initials: RA
authors.lastname: Tollenaar
mesh_terms: D001943:Breast Neoplasms / Q000601:surgery*; D005260:Female; D006760:Hospitalization; D006801:Humans; D015412:Mastectomy, Segmental / Q000592:standards*; D009426:Netherlands; D019984:Quality Indicators, Health Care