1. West China School of Nursing/West China Hospital, Sichuan University, Chengdu, Sichuan, China
2. Department of Nephrology, Hemodialysis Center, West China Hospital, Sichuan University, Chengdu, Sichuan, China
3. Department of Respiratory and Critical Care Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan, China