1,333
Participants
Start Date
July 1, 2017
Primary Completion Date
September 30, 2017
Study Completion Date
September 30, 2017
no intervention
This is a clinical observational study, no intervention was included.
Department of Respiratory and Critical Care Medicine, Beijing Anzhen Hospital, Capital Medical University, Beijing Institute of Heart, Lung and Blood Vessel Diseases, Beijing
Beijing Anzhen Hospital
OTHER