Funding for this research was provided by:
KWF Kankerbestrijding (KUN2015-8106)
Text and Data Mining valid from 2019-03-13
Received: 24 October 2018
Accepted: 21 February 2019
First Online: 13 March 2019
Ethics approval and consent to participate
: This study was approved by the medical ethical review board (region Arnhem-Nijmegen) under protocol number CMO2018-4420. The medical ethical review board waived the need of informed consent because of the retrospective nature of the study and anonymized handling of data.
: Not applicable.
: The authors declare that they have no competing interests.
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