1. Department
of Radiology, The Second Hospital of Tianjin Medical University, Tianjin 300211, China
2. Sex
Hormone Research Center, Tianjin Institute of Urology, Tianjin 300211, China
3. Biochemistry
and Molecular Pharmacology, University of Massachusetts Medical School, 364 Plantation Street, LRB 806 Worcester Massachusetts 01605, United States