. 2014 Nov 10;55(11):742–749. doi: 10.4111/kju.2014.55.11.742
© The Korean Urological Association, 2014
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.