Text and Data Mining valid from 2019-05-13
Received: 30 March 2019
Accepted: 3 May 2019
First Online: 13 May 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 standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from the individual participants included in the study. Additional informed consent was obtained from the participant for whom identifying information is included in this article.