[1] Cheng Hsin Gen Hosp, Dept Urol, Taipei, Taiwan
[2] Natl Yang Ming Chiao Tung Univ, Inst Clin Med, Taipei, Taiwan
[3] Natl Yang Ming Chiao Tung Univ, Shu Tien Urol Res Ctr, Taipei, Taiwan
[4] UCL, Wellcome EPSRC Ctr Intervent & Surg Sci WEISS, London, England
[5] Univ Coll London Hosp, Dept Colorectal Surg, London, England
[6] Taipei Vet Gen Hosp, Dept Urol, Taipei, Taiwan
[7] Taipei Vet Gen Hosp, Dept Urol, 201,Sec 2,Shi Pai Rd, Taipei 112, Taiwan