Text and Data Mining valid from 2018-12-06
First Online: 6 December 2018
Compliance with Ethical Standards
: The authors declare that they have no conflicts 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 for all individuals in the study.