. 2014 Jun;69(6):398–404. doi: 10.6061/clinics/2014(06)06
Copyright © 2014 Hospital das Clínicas da FMUSP
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.