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Why can the birth control “Nuvaring” be removed for up to 48 hours/month without decreasing efficacy, but “Annovera” can only be removed for 2 hours/month, even though they are both vaginal rings releasing the same hormones?

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Why can the birth control “Nuvaring” be removed for up to 48 hours/month without decreasing efficacy, but “Annovera” can only be removed for 2 hours/month, even though they are both vaginal rings releasing the same hormones?	3646