1. Tianjin Institute of Urology, the 2nd Hospital of Tianjin Medical University, Tianjin 300211, China
2. Department of Urology, First Affiliated Hospital, Shanxi Medical University, Shanxi 030001, China
3. Department of Health Science, Faculty of Health and Medical Sciences, University of Copenhagen, Copenhagen 2200, Denmark
4. Department of Pathology and Urology, University of Rochester, Rochester, NY 14620, USA