Funding for this research was provided by:
Text and Data Mining valid from 2019-04-16
Received: 9 October 2018
Accepted: 10 April 2019
First Online: 16 April 2019
Compliance with ethical standards
: The authors have nothing to declare.
: The study was approved by the Danish Data Protection Agency (Project Number BFH-2017-094). All methods were carried out in accordance with the relevant guidelines and regulations.