The authors of the recent article by Cera et al. (published online 7th June 2013) regret that the following information was omitted from the manuscript in error:
The authors gratefully acknowledge the funding for this project provided by the State of São Paulo Research Foundation (FAPESP 2008/52670-1) and the National Council for Scientific and Technological Development (CNPq 132979/2008-0). The authors are grateful to the participants for their time and effort.