Text and Data Mining valid from 2019-04-23
Received: 26 January 2018
Accepted: 21 March 2019
First Online: 23 April 2019
Ethics approval and consent to participate
: All participants were required to sign an inform consent after the interviewer (trained professionals) presented the study’s aims, methods and potential risks and benefits. Ethical approval was obtained for the survey protocol from the review board of the Portuguese National Public Health Institute and the National Data Protection Commission (legal state authority).
: Not applicable.
: The authors declare that they have no competing interests.
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