Funding for this research was provided by:
Fundação de Amparo à Pesquisa do Estado de São Paulo (2009/53227-7)
Text and Data Mining valid from 2017-10-31
Received: 22 April 2017
Accepted: 5 October 2017
First Online: 31 October 2017
Ethics approval and consent to participate
: The research and ethics committee of Universidade Federal de São Paulo approved the study (number 1387/10) and waived the need for informed consent because of the nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.