Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (01DK17016)
Text and Data Mining valid from 2019-07-31
Received: 19 April 2019
Revised: 14 June 2019
Accepted: 20 July 2019
First Online: 31 July 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This paper does not contain any studies with human or animal subjects.