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Prev Vet Med, 97(1):37-44, 15 Sep 2010
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Rev Med Inst Mex Seguro Soc, 47(3):277-284, 01 May 2009
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Salud Publica Mex, 50(4):286-291, 01 Jul 2008
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Gac Med Mex, 120(4):151-156, 01 Apr 1984
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