150
Participants
Start Date
June 30, 2015
Primary Completion Date
February 28, 2017
Study Completion Date
December 31, 2017
probiotics
Daily take 4.0E+10 CFU of probiotics
Placebo
Beijing Anzhen Hospital, Beijing
General Hospital of Chinese Armed Police Forces, Beijing
Peking University Aerospace Centre Hospital, Beijing
Peking University Aerospace Center Hospital
OTHER
General Hospital of Chinese Armed Police Forces
OTHER
Beijing Anzhen Hospital
OTHER
Beijing Biostats Technology Co. Ltd.
UNKNOWN
Beijing Heyiyuan Biotech Co. Ltd.
OTHER
China Agricultural University
OTHER