Funding for this research was provided by:
Seventh Framework Programme (613574)
Received: 23 July 2019
Accepted: 22 July 2020
First Online: 12 August 2020
Ethics approval and consent to participate
: No ethical approval was required for this observational study according to European an Belgian legislation involving experimental animals [CitationRef removed]. No animal experiments were performed during this investigation.A written informed consent was obtained from all farmers that participated in this study and farmers were aware that their (anonymized) data was used in the scope of this meta-analysis.
: Not applicable.
: The authors declare that they have no competing interests.