Text and Data Mining valid from 2018-04-09
Received: 3 December 2017
Accepted: 24 February 2018
First Online: 9 April 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This article does not contain any experimental studies with human participants or animals performed by any of the authors.
: All patients included in the study signed an informed consent.