Statistics from Altmetric.com
Funding This study was partially funded by Fundação de Amparo a Pesquisa do Estado de Alagoas (FAPEAL), Brazil.
Competing interests None declared.
Ethics approval The project was approved by the ethics committee of the Federal University of Alagoas, process no 000465/2007–96.
Provenance and peer review Not commissioned; externally peer reviewed.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.