Text and Data Mining valid from 2018-06-22
Received: 2 February 2018
Revised: 23 April 2018
Accepted: 14 May 2018
First Online: 22 June 2018
Compliance with ethical standards
: The authors of this manuscript declare no relationships with any companies whose products or services may be related to the subject matter of the article.
: • Retrospective• Observational• Performed at one institution