1. Department of Respiratory and Critical Care Medicine, The First Affiliated Hospital of Xi’an Medical University, Xi’an, Shaanxi, China
2. Department of Anesthesiology, Mayo Clinic, Rochester, MN, USA
3. Department of Respiratory and Critical Care Medicine, Guizhou Province People’s Hospital, Guiyang, Guizhou, China
4. Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN, USA