Department of Urology, Chonnam National University Medical School, Gwangju, Korea;
Department of Urology, Chosun University Medical School, Gwangju, Korea;
Department of Urology, Chonbuk National University Medical School, Jeonju, Korea;
Department of Urology, Wonkwang University School of Medicine, Iksan, Korea;
Department of Urology, Kwangju Christian Hospital, Gwangju, Korea;
Department of Urology, Chonnam National University Medical School, Gwangju, Korea;
Department of Urology, Chonnam National University Medical School, Gwangju, Korea;