1. Department of Respiratory and Critical Care Medicine, Lung Cancer Treatment Center, West China Hospital, Sichuan University, Chengdu, China
2. Department of Respiratory and Critical Care Medicine, Suining Central Hospital, Suining, China
3. Department of Respiratory and Critical Care Medicine, Affiliated Taihe Hospital of Hubei University of Medicine, Shiyan, China
4. Department of Respiratory and Critical Care Medicine, First Hospital of Qinhuangdao, Qinhuangdao, China
5. Department of Respiratory and Critical Care Medicine, Xiangya Hospital Central South University, Changsha, China
6. Division of Epidemiology, Department of Health Sciences Research, Mayo Clinic, Scottsdale, Arizona
7. Department of Respiratory and Critical Care Medicine, West China Hospital, Sichuan University, Chengdu, China