1. Department of Urology; Samsung Medical Center, Sungkyunkwan University School of Medicine; Seoul Korea
2. Department of Urology; Chosun University Hospital, Chosun University School of Medicine; Gwangju Korea
3. Department of Urology; Ewha Womans University Medical Center, Seoul Seonam Hospital; Seoul Korea
4. Department of Urology; Samsung Changwon Hospital, Sungkyunkwan University School of Medicine; Changwon Korea