Conflict of interest

The authors declare that they have no conflict of interest.

Ethical Approval

The study was approved by the ethics committee ‘EC Research UZ/KULeuven’ (S69288).

Consent for publication

Consent for publication was obtained for every individual person’s data included in the study.

Human or Animal Rights

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.

Informed consent

Informed consent was obtained from all individual participants included in the study.