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Useshuva Usefillah Utzedakah maavirin es roah hagezeira, where is this from?

Does anyone know the history of how "Useshuvah Usefillah Utzedakah maavirin es roah hagezeirah" was put into our Tefillah and/or who wrote it? (It's in the chazaras hashatz for musaf on Rosh Hashana ...