Text and Data Mining valid from 2019-01-10
First Online: 10 January 2019
Compliance with Ethical Standards
: Both 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. The current investigation was approved by an Institutional Review Board.