500
Participants
Start Date
January 1, 2018
Primary Completion Date
December 31, 2018
Study Completion Date
December 31, 2018
a cross-sectional survey
Collect the data of this year and compare it with that of ten years ago
2nd Affiliated Hospital, School of Medicine, Zhejiang University, Hanzhou
Second Affiliated Hospital, School of Medicine, Zhejiang University
OTHER