Text and Data Mining valid from 2019-03-12
Received: 20 December 2018
Accepted: 23 February 2019
First Online: 12 March 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with human participants or animals performed by any of the authors.
: Local ethical committee approved the use of anonymized historic samples and data for the study and waived informed consent from patients.