Article History
Received: 26 March 2019
Accepted: 11 June 2019
First Online: 26 June 2019
Compliance with ethical standards
:
: Tiago Guedes, Horácio Zenha, João Guimarães and Horácio Costa declare that they have no conflict of interest.
: Informed consent was obtained from the participant included in the study.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. For this kind of retrospective study formal consent is not required.