[1]Peking University, Department of Respiratory Diseases,Beijing,China
[2]Nanjing Medical University, First Affiliated Hospital,Nanjing,China
[3]China-Japan Friendship Hospital, Department of Critical Care Medicine,Beijing,China
[4]Nanjing Medical University,Nanjing,China
[5]s Hospital,Qingshuihe, Shenzhen,China
[6]Sichuan University, Department of Respiratory Medicine,Chengdu,China
[7]Southern Medical University,TongHe,China
[8]Soochow University,Suzhou,China
[9]Shenyang General Hospital of PLA,Shenyang,China
[10]China Medical University Shenyang, First Hospital,Shenyang,China
[11]Kunming General Hospital of Chengdu Military Command,Kunming,China
[12]Anhui Medical University, First Affiliated Hospital,Hefei,China
[13]Zhejiang University, School of Medicine,Hangzhou,China
[14]Shanghai Jiaotong University, School of Medicine,Shanghai,China
[15]Xinqiao Hospital, Department of Research,Chongqing,China
[16]Xijing Hospital,Xian,China
[17]Fudan University, Zhongshan Hospital,Shanghai,China
[18]Hebei Medical University, The Second Hospital,Shijiazhuang,China
[19]China-Japan Friendship Hospital, Department of Respiratory Medicine,Beijing,China
[20]Ningbo No. 2 Hospital,Ningbo,China
[No abstract available]