title: Patient safety improvement efforts: How do we know we have made an impact?
authors.affiliation: Department of Radiation Oncology and Molecular Radiation Sciences, Johns Hopkins School of Medicine, Baltimore, Maryland. Electronic address: stereza1@jhmi.edu.
authors.forename: Stephanie
authors.initials: S
authors.lastname: Terezakis
authors.affiliation: Department of Radiation Oncology, University of Washington, Seattle, Washington.
authors.forename: Eric
authors.initials: E
authors.lastname: Ford