Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
月经初潮年龄与母亲年龄、胎龄、BMI-Z评分的多元线性回归分析
 |
