Funding for this research was provided by:
Clinical research fund, university hospitals Leuven (na)
Kom op tegen Kanker (na)
Stichting Tegen Kanker (na)
Fonds Wetenschappelijk Onderzoek (na)
Received: 31 January 2019
Accepted: 14 May 2019
First Online: 27 May 2019
Ethics approval and consent to participate
: Approval from the Ethical Committee at the University Hospital Leuven was obtained for this study (S59162). The need for patients consent was waived, given the retrospective character of the study.
: Not applicable.
: The authors declare that they have no competing interests.