Ludwig, HC
Reitemeyer, M
Bock, HC
Sigler, M
Article History
Received: 25 July 2019
Accepted: 4 December 2019
First Online: 16 December 2019
Compliance with ethical standards
: Ethical approval was obtained from the institutional ethic board no. 12/9/17.
: On behalf of all authors, the corresponding author states that there is no conflict of interest.