1. Department of Critical Care Medicine, The First Affiliated Hospital of Nanchang University, Nanchang, Jiangxi, People’s Republic of China
2. Division of Pulmonary, Critical Care, Sleep and Allergy Medicine, University of Illinois, Chicago, Illinois
3. University of California, San Diego, California
4. Vanderbilt University Medical Center, Nashville, Tennessee
5. MD Anderson Cancer Center, University of Texas, Houston, Texas; and
6. Division of Pulmonary, Critical Care, Sleep, and Occupational Medicine, Indiana University School of Medicine, Indianapolis, Indiana