1. Department of Urology, Institute of Urology, Gansu Nephro‑Urological Clinical Center, Key Laboratory of Urological Diseases in Gansu Province, Lanzhou University Second Hospital, Lanzhou, Gansu 730030, P.R. China
2. Department of Skin and Venereal Diseases, Jincheng People's Hospital, Jincheng, Shanxi 048000, P.R. China