Received: 19 November 2018
Accepted: 21 March 2019
First Online: 3 April 2019
Ethics approval and consent to participate
: The regional institutional review board of the Radboudumc approved this study and waived the requirement to obtain informed consent. No administrative permissions were required to access the raw data from the Radboudumc.
: Not applicable.
: The authors declare that they have no competing interests.
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