title: Endometrial morphology during long-term use of levonorgestrel-releasing intrauterine devices.
mesh_terms: D003271:Contraceptive Agents, Female / Q000494:pharmacology*; D004717:Endometrium / Q000187:drug effects*; D005260:Female; D006801:Humans; D007436:Intrauterine Devices, Medicated; D016912:Levonorgestrel; D009644:Norgestrel / Q000494:pharmacology*; D013237:Stereoisomerism; D013997:Time Factors
chemical_list: D003271:Contraceptive Agents, Female; D009644:Norgestrel; D016912:Levonorgestrel