500,000
Participants
Start Date
January 31, 1999
Primary Completion Date
January 31, 2019
Study Completion Date
January 31, 2029
No intervention
RECRUITING
Zhejiang University, Hangzhou
Jiaxing Maternity and Child Health Care Hospital
OTHER
Qingdao University
OTHER
Westlake University
OTHER
Zhejiang University
OTHER