Annals of Epidemiology · 2008 · 80 citations · 26 references
EducationChronic Disease PreventionPhysical ActivityChronic Obstructive Pulmonary DiseaseLeisure-time Physical ActivityObstructive Lung DiseasePhysical Activity EpidemiologyPhysical FitnessChronic Obstructive Pulmonary Disease EpidemiologyConfoundingPhysical Activity DurationTime-varying ConfoundingUnobserved Confounding
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A Structural Approach to Selection Bias
Miguel A. Hernán, Sonia Hernández–Dı́az, James M. Robins · Epidemiology · 2004 · 2.8K citations