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Keywords: Ring tests for quality control
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Urol Int (1989) 44 (5): 298–302.
Published Online: 29 January 2010
...G. Rebentisch; W. Berg For five samples of our 5th international ring test for the quality control of methods of urinary calculus analysis we received 46 results from 19 countries obtained by means often different methods. The mean standard of quality (SQ) for all participants with quantitative...