Affiliation: | 1. Department of Epidemiology, School of Public Health, Zhengzhou University, Zhengzhou, Henan, China;2. Department of General Surgery, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China;3. Department of Urology, Zhengzhou Third People's Hospital, Zhengzhou, Henan, China;4. Department of International Medicine, Beaumont Health System, Royal Oak, Michigan |