title: Letter: Estimation of human placental lactogen in risk pregnancies by immunodiffusion.
mesh_terms: D005260:Female; D006801:Humans; D005779:Immunodiffusion; D010922:Placenta Diseases / Q000097:blood*; D010928:Placental Lactogen / Q000097:blood*; D011247:Pregnancy; D011863:Radioimmunoassay
chemical_list: D010928:Placental Lactogen