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Checkley SL, Campbell JR, Chirino-Trejo M, Janzen ED, Waldner CL.Checkley SL, et al.Can Vet J. 2010 Aug;51(8):853-61.Can Vet J. 2010.PMID: 21037885Free PMC article.
Checkley SL, Campbell JR, Waldner CL, Dowling PM, Chirino-Trejo M.Checkley SL, et al.Can Vet J. 2010 Nov;51(11):1283-6.Can Vet J. 2010.PMID: 21286332Free PMC article.