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