Text and Data Mining valid from 2019-02-01
First Online: 1 February 2019
Compliance with Ethical Standards
: All authors declares that he/she has no conflict of interest.
: Informed consent was obtained from all individual participants included in the study.
: 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.