Contraception / Humans / Natural Killer cells / Low Dose / Female / Infection / Clinical Sciences / T lymphocytes / Public health systems and services research / Oral Contraceptive / Infection / Clinical Sciences / T lymphocytes / Public health systems and services research / Oral Contraceptive
Contraception / Ultrasound / Low Dose / Menstrual Cycle / Clinical Sciences / Public health systems and services research / Oral Contraceptive / Public health systems and services research / Oral Contraceptive