Reference intervals from birth to adulthood for serum thyroxine (T4), triiodothyronine (T3), free T3, free T4, thyroxine binding globuline (TBG) and thyrotropin (TSH) - Elmlinger, MW; Kühnel, W; Lambrecht, HG; Ranke, MB (Clin Chem Lab Med, 2001)