Funding for this research was provided by:
Received: 14 April 2019
Accepted: 10 July 2019
First Online: 16 July 2019
Ethics approval and consent to participate
: This study has been approved by the ethical committee of Erasme Hospital, approval number 021/406. Consent to participate was waived due to the retrospective nature of the study.
: Not applicable.
: The authors declare that they have no competing interests.