Text and Data Mining valid from 2018-09-20
Received: 17 June 2018
Accepted: 7 September 2018
First Online: 20 September 2018
Ethics approval and consent to participate
: The study was approved by the medical ethics committee of the LUMC, who waived the need for individual informed consent as this was a pure observational study.
: Not applicable.
: The authors declare that they have no competing interests.
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