Received: 22 July 2019
Accepted: 29 October 2019
First Online: 21 November 2019
Ethics approval and consent to participate
: The study was approved by the local ethics committee, Departamento de Ensino, Formação e Investigação (DEFI) of Centro Hospitalar Universitário do Porto (CHUP) - ref. 2017.226(195-DEFI/187-CES). The need for consent was waived by the local ethics committee and patient data was de-identified.
: Not applicable.
: The authors declare that they have no competing interests.