2026-05-05 11:55 浏览次数 15
病例对照
DESIGN: a case-control study.
设计:对照实验研究。
Methods a case-control study was conducted in Xicheng District and Haidian District of Beijing in 2004.
方法于2004年在北京市西城区和海淀区进行病例对照调查。