The Veterinary Journal (2012) - Comments
doi: 10.1016/j.tvjl.2010.12.033  issn: 1090-0233  pubmed: 21330169  issn: 1532-2971 

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Hannah M. Hodgkiss-Geere, David J. Argyle, Brendan M. Corcoran, Bruce Whitelaw, Elspeth Milne, David Bennett, Sally A. Argyle