Pop-Ghe, Patricia
Stock, Norbert
Quandt, Eckhard
Funding for this research was provided by:
Deutsche Forschungsgemeinschaft (313454214, 313454214)
Article History
Received: 17 September 2019
Accepted: 3 December 2019
First Online: 24 December 2019
Competing interests
: The authors declare no competing interests.