[1] Jiaozhou Cent Hosp, Dept Urol Surg, Qingdao 266300, Shandong, Peoples R China
[2] 4 Peoples Hosp Jinan, Hemodialysis Room, Jinan 250031, Shandong, Peoples R China
[3] Qingdao Univ, Dept Urol Surg, Affiliated Qingdao Cent Hosp, Qingdao 266000, Shandong, Peoples R China
[4] Zhangqiu Dist Peoples Hosp, Dept Clin Lab, Jinan 250200, Shandong, Peoples R China
[5] Zhangqiu Dist Peoples Hosp, Dept Nephrol, Jinan 250200, Shandong, Peoples R China
[6] Third Peoples Hosp Qingdao, Dept Nephrol Geriatr, Qingdao 266041, Shandong, Peoples R China