1. Department of Laboratory Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, PR China
2. Intensive Care Units, West China Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China
3. Department of Respiratory Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan, 610041, PR China