1 Department of Pulmonary and Critical Care Medicine and.
2 National Center of Respiratory Medicine, National Clinical Research Center for Respiratory Diseases, Institute of Respiratory Medicine of Chinese Academy of Medical Sciences, Beijing, China; and.
3 Department of Infectious Diseases, The Affiliated Yantai Yuhuangding Hospital of Qingdao University, Yantai, China.
4 Department of Thoracic Surgery, Center of Respiratory Medicine, China-Japan Friendship Hospital, Beijing, China.