Text and Data Mining valid from 2019-08-09
Received: 9 November 2018
Accepted: 27 July 2019
First Online: 9 August 2019
Ethics approval and consent to participate
: This study was approved by the Ethics Committee of our University (Comissão de Ética para a Saúde do Centro Hospitalar São João/Faculdade de Medicina da Universidade do Porto, resolution number: CES-138/08). All participants received a written and verbal description of the study and gave their written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.