Text and Data Mining valid from 2018-02-27
Received: 9 November 2017
Accepted: 12 February 2018
First Online: 27 February 2018
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: The study was submitted to the Institutional Review Board of Radboud University Medical Centre, Nijmegen, and according to the Code of Conduct for the use of data in Health Research (Dutch Federation of Biomedical Scientific Societies, ExternalRef removed; ExternalRef removed), no ethical approval was needed for this observational study.
: Not applicable.
: The authors declare that they have no competing interests.
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