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Quantitative levonorgestrel plasma level measurements in patients with regular and prolonged use of the levonorgestrel-releasing intrauterine system

InfertilityHormonal ContraceptiveFertilityReproductive HealthProlonged UseGynecologyMaternal HealthLevonorgestrel-releasing Intrauterine SystemObstetricsMaternal-fetal MedicinePublic HealthEndocrinologyMedicineAnesthesiology