258
Participants
Start Date
June 30, 2016
Primary Completion Date
June 30, 2017
Study Completion Date
June 30, 2017
left lateral tilt-down position
patients will be positioned on their left side and at an angle of 20 degree
left lateral horizontal position
patients will be horizontally positioned on their left side
Changhai Hospital, Second Military Medical University, Shanghai
Changhai Hospital
OTHER