Text and Data Mining valid from 2018-12-17
Received: 24 April 2018
Accepted: 2 December 2018
First Online: 17 December 2018
Compliance with ethical standards
: The authors declare that they have no competing interests.
: 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 to be included in the study, or the equivalent, was obtained from all patients.