Text and Data Mining valid from 2019-01-02
Received: 31 August 2018
Accepted: 17 December 2018
First Online: 2 January 2019
Compliance with ethical standards
: None of the authors have conflicts of interest to declare.
: All procedures followed were in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1964 and later versions. Informed consent or substitute for it was obtained from all patients for being included in the study.