ten patients with primary hypothyroidism ( aged 32 -- 66 yr ) , replaced on constant daily doses of l-t4 ( mean +/- sd , 1.90 +/- 0.22 micrograms/kg bw ) , were used to examine seasonal variations in serum levels of thyroid-related hormones for a period of 14 months .
C0700502
primary hypothyroidism
C0040132
thyroid