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A5006845192 | I1330342723
Mayo Clinic
The Journal of Clinical Endocrinology & Metabolism | December 3, 2009 | Volume: 94 | Issue: 12 | Pages: 5001-5009
10.1210/jc.2009-1349 | PMID 19850689
Clinical Chemistry | May 25, 2004 | Volume: 50 | Issue: 6 | Pages: 1080-1082
10.1373/clinchem.2004.033183 | PMID 15161729