1. Department of Nephrology, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China
2. Department of Dermatology, Hebei Provincial Tumor Hospital, Shijiazhuang, Hebei 050011, P.R. China
3. Department of Oncology, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China
4. Hemodialysis Center, Hebei General Hospital, Shijiazhuang, Hebei 050051, P.R. China
5. Department of Urology, Hebei Provincial Tumor Hospital, Shijiazhuang, Hebei 050011, P.R. China