Text and Data Mining valid from 2018-07-25
Received: 6 March 2018
Accepted: 13 July 2018
First Online: 25 July 2018
Ethics approval and consent to participate
: The Ethics Committee of the Goethe University of Frankfurt, Germany, approved the study design (reference no. 31/16), which is in agreement with the Declaration of Helsinki (Version Fortaleza 2012). All subjects declared that they understood the experimental procedure and signed a written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.