Text and Data Mining valid from 2018-11-07
Received: 14 July 2018
Accepted: 29 October 2018
First Online: 7 November 2018
Compliance with ethical standards
: This study was not funded. WKJP has has not received research and educational grants or consulting fees.
: Ethical approval was agreed by the ethical committee of the Faculty of Medicine at the University of Göttingen, Germany.
: The study including human participants has been performed in accordance with the ethical standards of the Declaration of Helsinki and its later amendments.
: Informed consent was obtained from all individual patients including in the study.