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Thienpont, L.M., Faix, J.D. & Beastall, G. Standardization of FT4 and harmonization of TSH measurements: a request for input from endocrinologists and other physicians. Endocrine 50, 826–827 (2015). https://doi.org/10.1007/s12020-015-0752-1
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DOI: https://doi.org/10.1007/s12020-015-0752-1