title: [Research progress on case-control study].
abstract: Several new varients related to the case-control designs have been developed in the recent decades, and this article briefly summarized four new designs: two-stage design, case-specular study, exposure-crossover study and case-case-time-control study. This paper involved principles of study design, requisites for application, advantages and disadvantages on all the studies.
authors.affiliation: Department of Epidemiology, School of Public Health, Shandong University, Jinan 250012, China.
authors.forename: Feifei
authors.initials: F
authors.lastname: Zhang
authors.forename: Zhidong
authors.initials: Z
authors.lastname: Liu
authors.forename: Caixia
authors.initials: C
authors.lastname: Zhang
authors.forename: Baofa
authors.initials: B
authors.lastname: Jiang
mesh_terms: D016022:Case-Control Studies; D018592:Cross-Over Studies; D006801:Humans; D012107:Research Design / Q000639:trends*