1. Department of Nephrology, The Affiliated Hospital of Jining Medical University, Jining, Shandong 272400, P.R. China
2. Department of Pathology, The Affiliated Hospital of Jining Medical University, Jining, Shandong 272400, P.R. China
3. The First Maternity and Child Health Care Hospital of Rencheng District, Jining, Shandong 272400, P.R. China