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2. ISO General requirements for the competence of testing and calibration laboratories nd ed ISO;Geneva,2005
3. ISO Laboratory medicine requirements for reference measurement laboratories ISO;Geneva,2003
4. simplified method for the estimation of total cholesterol in serum and demonstration of its specificity;Abell;J Biol Chem,1952
5. comparison of the Doumas bilirubin reference method;Lo;Clin Biochem,2009