Document is current

Article History

First Online: 24 June 2020

Compliance with Ethical Standards

: All procedures performed in this study that involved human participants were in accordance with the ethical standards of the University of Coimbra and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The study was approved by the national ministry for education. Informed consent was obtained from all individual participants included in the study and, for underage participants, from their parents and/or legal guardians.

: On behalf of all authors, the corresponding author states that there is no conflict of interest. Though funding was received for this research it could not have influenced the outcomes of the research. The sponsor had no role in the design of the study, data collection, analysis and interpretation of data, writing of the report, and decision to submit the article for publication. This manuscript is based on data also used on the doctoral dissertation of the first author.