Weiwei Li1, Jing Wang2. 1. Department of Critical Care Medicine, Shengjing Hospital of China Medical University, 36 Sanhao Street, Heping District, Shenyang, 110004, Liaoning, People's Republic of China. 2. Department of Critical Care Medicine, Shengjing Hospital of China Medical University, 36 Sanhao Street, Heping District, Shenyang, 110004, Liaoning, People's Republic of China. cmu_wangjing@sina.com.