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      This information is produced and provided by the National Cancer Institute (NCI). The information in this topic may have changed since it was written. For the most current information, contact the National Cancer Institute via the Internet web site at http:// cancer .gov or call 1-800-4-CANCER.

      WebMD Medical Reference from Healthwise

      Last Updated: November 04, 2013
      This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.

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