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Johnston GR, Feeney DA, Rivers B, Walter PA.Johnston GR, et al. Among authors: walter pa.Vet Clin North Am Small Anim Pract. 1991 May;21(3):553-89. doi: 10.1016/s0195-5616(91)50061-9.Vet Clin North Am Small Anim Pract. 1991.PMID: 1858249Review.
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Rivers BJ, Walter PA, Feeney DA, Johnston GR.Rivers BJ, et al. Among authors: walter pa.Vet Radiol Ultrasound. 1997 Jul-Aug;38(4):300-6. doi: 10.1111/j.1740-8261.1997.tb00859.x.Vet Radiol Ultrasound. 1997.PMID: 9262687
Feeney DA, Johnston GR, Walter PA.Feeney DA, et al. Among authors: walter pa.Probl Vet Med. 1991 Dec;3(4):619-46.Probl Vet Med. 1991.PMID: 1802273Review.