1. Department of Nephrology, The Affiliated Hospital Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China
2. Department of Pulmonary and Critical Care Medicine, Guizhou Provincial People's Hospital, Guiyang, Guizhou 550002, P.R. China
3. Beijing Key Laboratory of Emerging Infectious Diseases, Institute of Infectious Diseases, Beijing Ditan Hospital, Capital Medical University, Beijing 100015, P.R. China