Text and Data Mining valid from 2018-12-03
Received: 10 April 2018
Accepted: 25 November 2018
First Online: 3 December 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: Ethical approval was agreed by the ethical committee of our institution (IRB File No. 2018-12-0003).
: The study including human participants has been performed in accordance with the ethical standards of the Declaration of Helsinki and its later amendments.
: For this retrospective review, formal consent is not required.