State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing, China. Department of Ultrasound, Peking Union Medical College Hospital, Beijing, China. Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing, China. Department of Respiration, Beijing Jishuitan Hospital, Beijing, China. Department of Respiration, the First Affiliated Hospital of Wenzhou Medical College, Zhejiang, China. Department of Respiration, Traditional Chinese Medicine Hospital of Xinjiang Uygur Autonomous Region, Xinjiang Uygur Autonomous Region, Uygur, China. Department of Respiration, Anhui Provincial Hospital, Hefei, China. Department of Respiration, People's Hospital of Xinjiang Uygur Autonomous Region, Xinjiang Uygur Autonomous Region, Uygur, China. Department of Respiration, Yanbian University Affiliated Hospital Organization, Yanji, China. Department of Respiration, Hebei Chest Hospital, Hebei, China. Department of Respiration, BaoDing No. 1 Hospital, Hebei, China. Department of Respiration, Shanghai Pulmonary Hospital, Shanghai, China. Department of Respiration, Zhuzhou People's Hospital of Hunan Province, Hunan, China. Department of Pulmonary and Critical Care Medicine, Peking Union Medical College Hospital, Beijing, China. Department of Pulmonary and Critical Care Medicine, East Hospital, Shanghai, China.