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1Gastrointestinal and Other Cancers Research Group, Division of Cancer Prevention, National Cancer Institute, EPN, Suite 2141, 6130 Executive Boulevard, Bethesda, MD 20892-7317, USA
1Gastrointestinal and Other Cancers Research Group, Division of Cancer Prevention, National Cancer Institute, EPN, Suite 2141, 6130 Executive Boulevard, Bethesda, MD 20892-7317, USA
Received 2004 Oct 26; Accepted 2004 Oct 26; Issue date 2004.