title: Understanding secondary databases: a commentary on "Sources of bias for health state characteristics in secondary databases".
authors.affiliation: Division of Pharmacoepidemiology and Pharmacoeconomics, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, 1620 Tremont Street, Suite 3030, Boston, MA 02120, USA. schneeweiss@post.harvard.edu
authors.forename: Sebastian
authors.initials: S
authors.lastname: Schneeweiss
mesh_terms: D015982:Bias; D003627:Data Interpretation, Statistical; D016208:Databases, Factual; D006304:Health Status; D006801:Humans; D010342:Patient Acceptance of Health Care