Funding for this research was provided by:
Fundação de Amparo à Pesquisa do Estado de São Paulo (2007/51488-2, 2012/22113-9, 98/14099-7, 2009/15831-0)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (472873/2012-1, 473100/2009-6, 481176/2008-0, 502948/2003-5, 301597/2017-0, 402674/2016-2)
Text and Data Mining valid from 2018-06-07
Received: 12 March 2018
Accepted: 28 May 2018
First Online: 7 June 2018
Ethics approval and consent to participate
: This survey was approved by the Ethics Committee on Research of the School of Public Health, University of São Paulo (reference number #64434717.2.0000.5421). Written informed consent/assent was obtained from all subjects before commencement of the study.
: The authors declare that they have no competing interests.
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