Text and Data Mining valid from 2018-06-05
First Online: 5 June 2018
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.
: The Institutional Review Board approved the preceding as an exempt study as it involved retrospective chart review.