1. Marathe PH, Gao HX, Close KL. American Diabetes Association standards of medical care in diabetes 2017. J Diabetes. 2017;9:320–4.
2. Müller-Wieland D, Petersmann A, Nauck M, et al. Definition, classification and diagnosis of diabetes mellitus. Diabetol Stoffwechs. 2016;11:S78–81.
3. World Health Organization. Use of glycated haemoglobin (HbA1c) in the diagnosis of diabetes mellitus: abbreviated report of a WHO consultation. WHO guidelines approved by the Guidelines Review Committee. Geneva: World Health Organization; 2011.
4. Joint Committee for Guides in Metrology (JCGM). Evaluation of measurement data—guide to the expression of uncertainty in measurement. JCGM 100:2008. https://www.bipm.org/en/publications/guides/gum.html.
5. Büttner J, Broth R, Broughton PM, Bowyer RC. International Federation of Clinical Chemistry. Committee on standards. Expert panel on nomenclature and principles of quality control in clinical chemistry. IFCC document stage 2, draft 3; 1979-07 with a view to an IFCC recommendation. Quality control in clinical chemistry. Part 4. Internal quality control. J Clin Chem Clin Biochem 1980;18:535–541.