1. Department of Urology, Cancer Hospital of China Medical University, Liaoning�Cancer Hospital and Institute, Shenyang, Liaoning�110042, P.R.�China
2. Department of Urology, Cancer Hospital of China Medical University, Liaoning Cancer Hospital and Institute, Shenyang, Liaoning 110042, P.R. China
3. Department of Urology, The First Hospital of China Medical University, Shenyang, Liaoning�110001, P.R.�China