AUTHOREA
Log in
Sign Up
Browse Preprints
LOG IN
SIGN UP
Essential Maintenance
: All Authorea-powered sites will be offline 9am-10am EDT Tuesday 28 May
and 11pm-1am EDT Tuesday 28-Wednesday 29 May. We apologise for any inconvenience.
Jiyuan Shi
Public Documents
1
July 21, 2020
Improvement was needed in the standards of development for obstetrics and gynecology...
Jiyuan Shi, Ya Gao, Mingming Niu, et al.