Plasma concentrations of TSH, free triiodothyronine (Feet3), and free thyroxine (Feet4) were measured using a chemiluminescent immunoassay (Vitros Reagent, Ortho-Clinical Diagnostics, Johnson & Johnson Medical Section, Milan, Italy)
Plasma concentrations of TSH, free triiodothyronine (Feet3), and free thyroxine (Feet4) were measured using a chemiluminescent immunoassay (Vitros Reagent, Ortho-Clinical Diagnostics, Johnson & Johnson Medical Section, Milan, Italy). in more youthful vs older participants, respectively,P