Guangzhou Medical University - Department of Blood Transfusion, Chinese PLA General Hospital - College of Pulmonary and Critical Care Medicine, General Hospital of Southern Theatre Command of PLA - Department of Laboratory Medicine, Yale University - Section of Pulmonary and Critical Care and Sleep Medicine, Guangzhou Medical University - Department of Blood Transfusion, Yale University - Section of Pulmonary and Critical Care and Sleep Medicine, Chinese PLA General Hospital - College of Pulmonary and Critical Care Medicine, Guangzhou Medical University - Department of Blood Transfusion, Yale University - Section of Pulmonary and Critical Care and Sleep Medicine and Yale University - Section of Pulmonary and Critical Care and Sleep Medicine