. 2017 Dec 16;68(4):421–424. doi: 10.1016/j.bjane.2017.11.007
© 2017 Sociedade Brasileira de Anestesiologia. Published by Elsevier Editora Ltda.
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).