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References

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    Bachner P, Kimler SC. Quality control in the new environment. Part III: automated hematology. MLO Med Lab Obs. 1986;18:4954.
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    Westgard JO. Basic QC Practices. 3rd ed. Madison, WI: Westgard Quality Corporation; 1998: 115, 83.
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    Quality cost worksheets. Available at: http://www.westgard.com/pdf/6sigcostworksheets.pdf. Accessed July 26, 2012.
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    QC online calculators. Available at: http://tools.westgard.com/qccalculator.html. Accessed July 26, 2012.
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    EZ Rules 3 QC Design Software. Available at: http://www.westgard.com/ezrules.html. Accessed July 26, 2012.
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    Freeman KP, Gruenwaldt J. Quality control validation in veterinary laboratories. Vet Clin Pathol. 1999;28:150155.
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    Westgard JO. Internal quality control: planning and implementation strategies. Ann Clin Biochem. 2003;40:593611.
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    Flatland B, Freeman KP, Friedrichs KR, et al. ASVCP quality assurance guidelines: control of general analytical factors in veterinary laboratories. Vet Clin Pathol. 2012;39:265277.
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    Petersen PH, Ricos C, Stockl D., et al. Proposed guidelines for the internal quality control of analytical results in the medical laboratory. Eur J Clin Chem Clin Biochem. 1996;34:983999.