Funding for this research was provided by:
Text and Data Mining valid from 2019-08-16
Received: 31 October 2018
Accepted: 12 July 2019
First Online: 16 August 2019
Ethics approval and consent to participate
: Ethical approval for this study was obtained from the Leiden University Medical Centre Ethical Committee (CME LUMC Leiden, reference number NL64553.058.18). All participants give online informed consent for participating in the study.
: Not applicable.
: The authors declare that they have no competing interests.