can case studies be transformed into retrospective cohort studies is a retrospective cohort study an experiment or control study? can a retrospective cohort study become a case-control study is a retrospective cohort considered a case control can the retrospective cohort study be classified as case control what is retrospective cohort what is a case control study of a case are retrospective cohort studies case studies can a retrospective cohort study be turned into a case-control study what is a retrospective cohort study can a retrospective cohort study be a control study when to transform retrospective cohort study can retrospective cohort studies be made case studies what is retrospective cohort study? when is cohort studies transformed can a retrospective cohort study be transformed into a case control study? can you turn a retrospective cohort study into a case control study? what is the difference between a retrospective cohort and case study? can a retrospective cohort study be transformed into a case control study what is a case study and retrospective cohort study