Text and Data Mining valid from 2019-08-08
Accepted: 1 August 2019
First Online: 8 August 2019
Compliance with ethical standards
: The authors declare that they have no competing interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
: Informed consent was obtained from all participants included in this study.