Switching from progestogen based contraception to combined hormonal contraception (CHC)
CHC, combined hormonal contraception; COC, combined oral contraception; CTP, combined transdermal patch; CVR, combined vaginal ring; LNG-IUS, levonorgestrel-releasing intrauterine system; POP, progestogen-only pill; UPSI, unprotected sexual intercourse.
*9 days estradiol valerate/dienogest pill.
Reference:
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