1. Department of Pulmonary and Critical Care Medicine, The Second Affiliated Hospital of Guangxi Medical University, Nanning Guangxi, China
2. Emergency Department, Guangxi District Maternal and Child Health Hospital, Nanning, Guangxi, China
3. Clinical Medical College of Chengdu Medical College, Chengdu, Sichuan, China
4. Department of Pulmonary and Critical Care Medicine, The First Affiliated Hospital of Chengdu Medical College, Chengdu, Sichuan, China