Funding for this research was provided by:
Received: 15 February 2018
Accepted: 19 June 2018
First Online: 27 June 2018
Ethics approval and consent to participate
: Not applicable, as this study was done from archived sera and permission to these for research had been obtained at the time of serum submission to the laboratory.
: Not applicable
: TO declares having received consulting and lecturing honoraria and research funding from Royal Canin; JB is an employee of Avacta Animal Health.
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