Ifanewdrugdecreasestheriskofbreastcancerinpostmenopausalwomenfrom0.3%peryearto0.15%peryear,whichofthefollowingaccuratelydescribesthechangeinrisk?
Ifanewdrugdecreasestheriskofbreastcancerinpostmenopausalwomenfrom0.3%peryearto0.15%peryear,whichofthefollowingaccuratelydescribesthechangeinrisk?
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