text_1: 所有 分析 均 采用 Stata 软件 15 版 ( StataCorp ) 和 R 3.5 . 1 版 ( R Foundation for Statistical Computing ) 进行 .
  
text_2: all the analyses were performed with the use of Stata software , version 15 ( StataCorp ) and R , version 3.5.1 ( R Foundation for Statistical Computing ) .
  