Received: 3 January 2019
Accepted: 20 September 2019
First Online: 16 October 2019
: All procedures were conducted in accordance with the guidelines of Care and Use of Animals outlined by Italian law, and the procedure was approved by the Ethical Animal Care and Use Committee of University of Naples Federico II-Department of Veterinary Medicine and Animal Productions (Protocol number: 2018/0101745). Written consent of all animal owners was obtained before their inclusion in the study.
: Not applicable.
: Professor Giuseppe Spinella is associate editor of BMC Veterinary Research, and he was not involved in the editorial handling of this manuscript. All other authors have no competing interests.