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Jeon CH, Lee AJ, Kim SG, Suh HS, Bae YC.  Annual Report on the External Quality Assessment Scheme for Urinalysis and Fecal Occult Blood Testing in Korea (2017).  J Lab Med Qual Assur 2018;40:128-135.  https://doi.org/10.15263/jlmqa.2018.40.3.128