title: Serum LH concentration in women under contraceptive treatment with estrogen-free progestagens.
mesh_terms: D005260:Female; D006801:Humans; D007106:Immune Sera; D007273:Injections, Intramuscular; D007986:Luteinizing Hormone / Q000097:blood*; D008598:Menstruation; D009640:Norethindrone / Q000008:administration & dosage / Q000494:pharmacology*; D009644:Norgestrel / Q000494:pharmacology*; D011863:Radioimmunoassay; D013997:Time Factors
chemical_list: D007106:Immune Sera; D009644:Norgestrel; D007986:Luteinizing Hormone; D009640:Norethindrone