Elucidation of some epidemiologic principles.
这篇综述试图阐明病例对照研究设计及其与队列研究的关系，并讨论不同暴露人群可比性判断中的混杂问题。
This review is an attempt to elucidate some fundamental epidemiologic concepts, particularly various aspects of the case-referent design and its relations to the cohort type of study. Some of these aspects also have direct implications for judgements about the comparability of differently exposed population groups, eg, with regard to confounding.