Department of Pulmonary and Critical Care Medicine,Qingdao Municipal Hospital,Qingdao,Shandong 266011,China

Department of Nosocomial Infection,Qingdao Municipal Hospital,Qingdao,Shandong 266011,China

Department of Infectious Diseases,Nanjing Lishui People,s Hospital,Nanjing,Jiangsu 211213,China

Department of Pulmonary and Critical Care Medicine,National Clinical Research Center of Respiratory Diseases,Center for Respiratory Diseases,China-Japan Friendship Hospital,Beijing 100020,China

Department of Respiratory Medicine,Yan'an Hospital Affiliated to Kunming Medical University,Kunming,Yunnan 652199,China

Department of Respiratory Medicine,Beijing Huimin Hospital,Beijing 100054,China

Department of Pulmonary and Critical Care Medicine,Zibo Municipal Hospital,Zibo,Shandong 255000,China

Department of Respiratory Medicine,Beijing Luhe Hospital,Capital Medical University,Beijing 101149,China

Department of Pulmonary and Critical Care Medicine,Weifang No.2 People's Hospital,Weifang,Shandong 261599,China

Department of Respiratory Medicine,Shandong University Affiliated Qilu Hospital(Qingdao),Qingdao,Shandong 266035,China

Department of Respiratory Medicine,the 2nd Hospital of Beijing Corps,Chinese Armed Police Forces,Beijing 100044,China

Department of Infectious Disease,Qingdao University Medical College Affiliated Yantai Yuhuangding Hospital,Yantai,Shandong 100191,China

Department of Respiratory Medicine,Rizhao Chinese Medical Hospital Affiliated to Shandong Chinese Medical University,Rizhao,Shandong 276800,China

Department of Respiratory Medicine,Beijing Hospital of Traditional Chinese Medicine Affiliated to Capital Medical University,Beijing 100010,China

Department of Occupational Medicine and Toxicology,Beijing Chao-Yang Hospital,Capital Medical University,Beijing 100020,China