Fig. 1. Images of urine sediments for external quality assessment. (A) CUI-19-01 transitional epithelial cells (original magnification×400). (B) CUI-19-02 contrast media (original magnification×200). (C) CUI-19-03 ammonium magnesium phosphate (original magnification×400). (D) CUI-19-04 white blood cell cast (original magnification×400).
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