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There is substantial geographic variation in the rates of epidural steroid injections within the United States.
在联邦内硬膜外类固醇注射的使用率实际存在着地域性差异。
youdao
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There is substantial geographic variation in the rates of epidural steroid injections within the United States.
在联邦内硬膜外类固醇注射的使用率实际存在着地域性差异。
youdao