1 Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Soochow University, Suzhou 215006, China.
2 Department of Epidemiology, School of Public Health and Jiangsu Key Laboratory of Preventive and Translational Medicine of Geriatric Diseases, Medical College of Soochow University, Suzhou 215123, China.
3 Department of Hematology and Medical Oncology, Emory University School of Medicine and Winship Cancer Center, Atlanta, GA, USA.