1. Intensive Care Unit, Shandong Provincial Hospital Affiliated to Shandong First Medical University , Jinan , Shandong Province , China
2. Intensive Care Unit, Dong E Hospital , Liaocheng , Shandong Province, China
3. Division of Pulmonary and Critical Care Medicine, Department of Medicine, Mayo Clinic , Rochester , MN , USA
4. Division of Nephrology and Hypertension, Department of Medicine, Mayo Clinic , Rochester , MN , USA