1 Department of Urology, First Hospital of Qinhuangdao, Qinhuangdao, China.
2 Department of Pediatrics, First Hospital of Qinhuangdao, Qinhuangdao, China.
3 Department of General Surgery, First Hospital of Qinhuangdao, Qinhuangdao, China; Department of Surgery, Hebei Medical University, Shijiazhuang, China. Electronic address: wangyimin0335@126.com.