title: CNR external quality control for the assay of some steroids: results of the first half-year activity.
mesh_terms: D004958:Estradiol / Q000097:blood; D006801:Humans; D006854:Hydrocortisone / Q000097:blood; D007558:Italy; D007753:Laboratories / Q000592:standards*; D011374:Progesterone / Q000097:blood; D011786:Quality Control; D011863:Radioimmunoassay / Q000592:standards*; D013256:Steroids / Q000097:blood*; D013739:Testosterone / Q000097:blood
chemical_list: D013256:Steroids; D013739:Testosterone; D011374:Progesterone; D004958:Estradiol; D006854:Hydrocortisone