13,542
Participants
Start Date
August 1, 2019
Primary Completion Date
October 30, 2019
Study Completion Date
March 10, 2021
No intervention
This is an observational study without any interventions.
Peking University Health Science Center, Beijing
Shandong University, Jinan
Fudan University, Shanghai
Centers for Disease Control and Prevention, China
OTHER_GOV
Fudan University
OTHER
Shandong University
OTHER
Peking University
OTHER