Christopher R-Gregory, Kenneth S. Latimer, Frank D. Niagro, Branson W. Ritchie, Raymond P. Campagnoil, Terry M. Norton, Rita McManamon, Cheryl B. Greenacre, A Review of Proventricular Dilatation Syndrome, Journal of the Association of Avian Veterinarians, Vol. 8, No. 2 (1994), pp. 69-75
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R-Gregory et al. (1994) studied this question.
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