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Authors
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Oliveira, Andreia http://orcid.org/0000-0002-6714-5939
Araújo, Joana
Severo, Milton
Correia, Daniela
Ramos, Elisabete
Torres, Duarte
Lopes, Carla
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Funding
Funding for this research was provided by:
EEA Grants Program, Public Health Initiatives (PT06 - 000088SI3)
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Article History
Received: 14 September 2017
Accepted: 19 April 2018
First Online: 11 May 2018
Ethics approval and consent to participate
: Ethical approval was obtained from the National Commission for Data Protection, the Ethical Committee of the Institute of Public Health of the University of Porto and from the Ethical Commissions of the Regional Administrations of Health. All participants were asked to provide their written informed consent according to the Ethical Principles for Medical Research involving human subjects expressed in the Declaration of Helsinki and the national legislation. Written agreements from the parents were required for children and adolescents under 18 years old. Adolescents (10–17 years old) were also asked to sign the consent form together with their legal representative. All documents with identification data were treated separately and stored in a different dataset.
: The authors declare that they have no competing interests.
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