1. Causation, bias and confounding: a hitchhiker’s guide to the epidemiological galaxy. Part 1. Principles of causality in epidemiological research: time order, specification of the study base and specificity;Shapiro, S.;J Fam Plan Reprod Health Care,2008
2. Causation, bias and confounding: a hitchhiker’s guide to the epidemiological galaxy. Part 3: Principles of causality in epidemiological research: statistical stability, doseand duration-response effects, internal and external consistency, analogy, and biological plausibility;Shapiro, S.;J Fam Plan Reprod Health Care,2008
3. The need for randomization in the study of intended effects;Miettinen, O.;Stat Med,1983
4. Invited commentary. Shifting the burden of proof regarding biases and low magnitude associations;Hertz-Picciotto, I.;Am J Epidemiol,2000
5. Carcinogenicity of combined oestrogen-progestogen contraceptives and menopausal treatment;Cancer;Lancet Oncol,2005