title: Inverse probability weighting with time-varying confounding and nonpositivity.
authors.forename: Igor
authors.initials: I
authors.lastname: Karp
mesh_terms: D015986:Confounding Factors, Epidemiologic; D015989:Healthy Worker Effect; D006801:Humans; D016273:Occupational Exposure / Q000706:statistics & numerical data*; D016016:Proportional Hazards Models