700
Participants
Start Date
January 1, 2012
Primary Completion Date
December 31, 2020
Study Completion Date
December 31, 2020
Daping Hospital and the Research Institute of Surgery of the Third Military Medical University, Chongqing
maternal and child health hospital of Yong Chuan District
UNKNOWN
Daping Hospital and the Research Institute of Surgery of the Third Military Medical University
OTHER