Text and Data Mining valid from 2019-07-12
Received: 18 February 2019
Revised: 4 June 2019
Accepted: 27 June 2019
First Online: 12 July 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.All authors gave final approval for publication. GJN takes full responsibility for the work as a whole, including the study design, access to data, and the decision to submit and publish the manuscript.
: The Institutional Review Board approved this study.