Text and Data Mining valid from 2019-11-18
Received: 16 August 2019
Accepted: 6 November 2019
First Online: 18 November 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standard of the institutional and/or national research committee (REK) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. For this type of study, formal consent is not required. Informed consent was obtained from all individual participants included in the study.