Text and Data Mining valid from 2019-06-18
Received: 8 February 2019
Accepted: 23 May 2019
First Online: 18 June 2019
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.
: Consent for publication was obtained for every individual person’s data included in the study.
: The authors are solely responsible for the design and conduct of this study, all study analyses, the drafting and editing of this paper and its final contents.
: For this type of study, formal consent is not required.
: Informed consent was obtained from all individual participants included in the study.