设计：以诊断为依据、社区为基础的横断面研究。

DESIGN: a cross-sectional study according to the diagnosis and on the basis of community.

youdao

设计：一项横断面研究。

DESIGN: This was a cross-sectional study.

youdao

设计：一项横断面研究。

DESIGN: This was a cross-sectional study.

youdao