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Mayo Clinic
Clinical Chemistry | January 20, 2020 | Volume: 27 | Issue: 11 | Pages: 1963-1963
10.1093/clinchem/27.11.1963
Annals of Internal Medicine | April 12, 2013 | Volume: 93 | Issue: 4 | Pages: 631-631
10.7326/0003-4819-93-4-631_1