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National Cancer Institute (NCI) is responsible for the SAS programs and information on its website. The content on the website is subject to change at any time without notice. Reasonable measures have been taken to ensure the accuracy of the information on the website. However, the accuracy of the information on the site is not guaranteed and data users should always check the programs and resulting data output carefully. Questions or problems pertaining to the NCI programs or website should be directed to NCI, not NCHS.