Funding for this research was provided by:
GUDP (Green Development and Demonstration Programme), Ministry of Environment and Food of Denmark (34009-14-0849)
Received: 5 June 2020
Accepted: 11 December 2020
First Online: 4 January 2021
Ethics approval and consent to participate
: Not applicable as no experiments on animals or humans were used in this study.
: Not applicable.
: The authors declare that they have no competing interests.