1. Department of Respiratory and Critical Care Medicine; Second Affiliated Hospital of Xi'an Jiaotong University; Xi'an China
2. Department of Respiratory Medicine; Shaanxi Provincial People's Hospital; Xi'an China
3. Department of Emergency Medicine; Second Affiliated Hospital of Xi'an Jiaotong University; Xi'an China
4. Department of Oncology; Tongji University School of Medicine Affiliated to Shanghai East Hospital; Shanghai China