Text and Data Mining valid from 2018-10-12
Received: 17 August 2018
Accepted: 2 October 2018
First Online: 12 October 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: Not applicable.
: This article does not contain any studies with human participants or animals performed by any of the authors. As such, in our institution, approval by the institutional review board is not needed. On similar terms, informed consent other than medical management is not required.