Pei-Jun Li1, Zong-An Liang1, Ping Fu2, Yuan Feng3. 1. Department of Respiratory and Critical Care Medicine, West China Hospital, Sichuan University, Chengdu - PR China. 2. Department of Nephrology, West China Hospital, Sichuan University, Chengdu - PR China. 3. Department of Cardiology, West China Hospital, Sichuan University, Chengdu - PR China.