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. 2015 Aug 4;24(11):691–699. doi: 10.1136/bmjqs-2014-003712

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This is an Open Access article distributed in accordance with the terms of the Creative Commons Attribution (CC BY 4.0) license, which permits others to distribute, remix, adapt and build upon this work, for commercial use, provided the original work is properly cited. See: http://creativecommons.org/licenses/by/4.0/

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Conceptual framework for testing process and associated errors in sample processing after Hickner et al² and Carraro and Plebani.¹