. 2011 Jan;66(1):101–106. doi: 10.1590/S1807-59322011000100018
Copyright © 2011 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.