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Original publication

DOI

10.1136/bmj.j4587

Type

Journal article

Journal

Bmj

Publication Date

16/10/2017

Volume

359

Keywords

Biomedical Research, Confounding Factors, Epidemiologic, Female, Humans, Longitudinal Studies, Male, Observational Studies as Topic, Observer Variation, Proportional Hazards Models, Research Design, Sensitivity and Specificity, Time Factors, United Kingdom