Text and Data Mining valid from 2018-12-04
First Online: 4 December 2018
Compliance with Ethical Standards
: 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 all individual participants included in the study.
: Author A declares that he has no conflict of interest. Author B declares that he has no conflict of interest.