Funding for this research was provided by:
DFG (KR 3930/8-1; TR 864/12-1; PE 1632/17-1)
Article History
Received: 5 March 2020
Accepted: 24 June 2020
First Online: 14 July 2020
Ethics approval and consent to participate
: Not applicable.
: Not applicable.
: The authors of this paper are members of the o2r project that was also discussed in this paper ().