'Breast cancer biomarkers in clinical testing: analysis of a UK NEQAS ICC & ISH database containing results from 199 300 patients': by Andrew Dodson1, 2, Suzanne Parry3, Merdol Ibrahim3, John MS Bartlett4, Sarah Pinder5, Mitch Dowsett1, 2 and Keith Miller3, J Pathol Clin Res 2018; 4: 262–273, https://doi.org/10.1002/cjp2.112. (7th July 2020) - Unknown