1. Department of Critical Care Medicine, The Sixth Affiliated Hospital of Harbin Medical University, Harbin, China
2. Department of Critical Care Medicine, The Second Affiliated Hospital of Harbin Medical University, Harbin, China
3. Department of Critical Care Medicine, The Yichun Forestry Administration Central Hospital, Yichun, China
4. Department of Critical Care Medicine, The Jiamusi Cancer Hospital, Jiamusi, China
5. Department of Critical Care Medicine, The First People Hospital of Mudanjiang city, Mudanjiang, China
6. Department of Critical Care Medicine, The Hongxinglong Hospital of Beidahuang Group, Shuangyashan, China
7. Department of Critical Care Medicine, The Hongqi Hospital Affiliated to Mudanjiang Medical University, Mudanjiang, China
8. Department of Critical Care Medicine, The First Affiliated Hospital of Harbin Medical University, Harbin, China