title: A valid nested case-control design?
authors.affiliation: Department of Preventive Medicine and Biostatistics, University of Toronto, Ontario, Canada.
authors.forename: A B
authors.initials: AB
authors.lastname: Miller
mesh_terms: D015331:Cohort Studies; D006258:Head and Neck Neoplasms / Q000453:epidemiology / Q000209:etiology*; D006801:Humans; D012107:Research Design; D012189:Retrospective Studies; D012307:Risk Factors