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Hill RC, Fox LE, Lewis DD, Beale KM, Nachreiner RF, Scott KC, Sundstrom DA, Jones GL, Butterwick RF.Hill RC, et al. Among authors: butterwick rf.Am J Vet Res. 2001 Dec;62(12):1969-72. doi: 10.2460/ajvr.2001.62.1969.Am J Vet Res. 2001.PMID: 11763190Free article.