Yen-Man Lu1,2, Tsu-Ming Chien1,2, Yii-Her Chou3,4,5. 1. Department of Urology, Kaohsiung Medical University Hospital, No. 100, Tz-You 1st Road, Kaohsiung, 807, Taiwan. 2. Department of Urology, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan. 3. Department of Urology, Kaohsiung Medical University Hospital, No. 100, Tz-You 1st Road, Kaohsiung, 807, Taiwan. slaochain@hotmail.com. 4. Department of Urology, School of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan. slaochain@hotmail.com. 5. Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan. slaochain@hotmail.com.