title: Observational health services studies using nationwide administrative datasets: understanding strengths and limitations of the National Hospital Ambulatory Medical Care Survey (NHAMCS).
authors.affiliation: Vanderbilt University Medical Center, Nashville, TN, USA.
authors.forename: Candace D
authors.initials: CD
authors.lastname: McNaughton
authors.forename: Wesley H
authors.initials: WH
authors.lastname: Self