1. Sex Hormone Research Center, Tianjin Institute of Urology, the Second Hospital of Tianjin Medical University, Tianjin, China
2. University of Rochester, Rochester, New York, USA
3. Department of Biochemistry and Molecular Biology, College of Life Sciences, Nankai university, Tianjin, China
4. Department of Urology, Changhai Hospital of the Second Military Medical University, Shanghai, China