Received: 19 February 2019
Accepted: 21 November 2019
First Online: 2 December 2019
Ethics approval and consent to participate
: Ethics approval was granted by the Portuguese Data Protection Authority and the Ethics Committee for Health from the Centro Hospitalar Universitário do Porto, where data was collected, and all procedures performed in this study involving human participants were in accordance with the ethical standards of 1964 Helsinki declaration and its later amendments. Written informed consent was obtained from all donors and recipients prior to participation in the study, following the World Medical Association Declaration of Helsinki and the Oviedo Convention.
: Written informed consent for publication of data was obtained from all individual participants included in the study.
: The authors declare that they have no competing interests.