Funding for this research was provided by:
Text and Data Mining valid from 2019-04-16
Received: 30 August 2018
Accepted: 18 March 2019
First Online: 16 April 2019
Compliance with ethical standards
: According to the Dutch Medical Research Involving Human Subjects Act, ethical approval was not necessary; patients were not subjected to procedures or required to follow rules of behavior.
: The authors declare that they have no conflict of interest.