Sigma metrics as a valuable tool for effective analytical performance and quality control planning in the clinical laboratory: A retrospective study

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DescriptionBeluga 1 1999-07-03.jpg	White Whale or Beluga Whale (Delphinapterus leucas) from Churchill River near Hudson Bay (Canada)
Date	3 July 1999
Source	photo taken by Ansgar Walk
Author	Ansgar Walk

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current	10:19, 9 March 2006		4,464 × 3,300 (696 KB)	Ansgar Walk	{{Information\| \|Description = White Whale or Beluga Whale (Delphinapterus leucas) from Churchill River near Hudson Bay, Canada) \|Source = photo taken by Ansgar Walk \|Date = created July 03, 1999 \|Author = Ansgar Walk \|Permission = \|other_versions = }} [[

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