Received: 27 February 2021
Accepted: 21 April 2021
First Online: 30 April 2021
: This study was approved by the Ethics Committee Research UZ/KU Leuven. Consent to participate was waived by the ethical committee due to the retrospective nature of the study.
: All co-authors have given their consent for publication.
: All authors declare that they have no competing interests.