1. Department of Nephrology, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
2. Department of Cardiology, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China
3. Department of Infectious Disease, Heilongjiang Provincial People's Hospital, Harbin, Heilongjiang 150001, P.R. China