Text and Data Mining valid from 2018-03-08
Received: 12 April 2017
Accepted: 2 January 2018
First Online: 8 March 2018
Compliance with ethical standards
: The authors declare they have no conflict of interest. There was no funding source for this study. This article does not contain any studies with human participants or animals performed by any of the authors. This study was IRB exempt; informed consent from individual participants was not applicable to study methods.