title: Results of external quality control trials performed by the German Cooperative Group for Receptor Assay Standardization.
mesh_terms: D001943:Breast Neoplasms / Q000032:analysis* / Q000473:pathology; D005260:Female; D005860:Germany, West; D006801:Humans; D007753:Laboratories / Q000592:standards; D011786:Quality Control; D011987:Receptors, Steroid / Q000032:analysis*
chemical_list: D011987:Receptors, Steroid