140
Participants
Start Date
January 1, 2021
Primary Completion Date
October 31, 2021
Study Completion Date
December 31, 2021
tight-fitting simple facemask
Oxygen will be administered by facemask at 10 L/min oxygen. The therapy will continue until after delivery
Department of Obstetrics and Gynecology, PLA Strategic Support Force Characteristic Medical Center, Beijing
Department of Obstetrics and Gynecology, Seventh Medical Center, Chinese PLA General Hospital, Beijing
Department of Obstetrics and Gynecology, Sixth Medical Center, Chinese PLA General Hospital, Beijing
Navy General Hospital, Beijing
OTHER