Department of Pulmonary and Critical Care, Peking University People's Hospital, Beijing, China. Department of Pulmonary and Critical Care, the Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China. National Protein Science Technology Center, Tsinghua University, Beijing, China. Department of Pulmonary and Critical Care, Fujian Provincial Hospital, Fuzhou, China. Department of Pulmonary and Critical Care, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China. CAS Key Laboratory of Genome Sciences and Information, Beijing Institute of Genomics, Chinese Academy of Sciences, Beijing, China. kangy@big.ac.cn. Department of Pulmonary and Critical Care, Peking University People's Hospital, Beijing, China. zcgao@bjmu.edu.cn.