citation journal title = Diseases of the Colon amp Rectum citation issn = 00123706 citation volume = 50 citation issue = 7 citation doi = 101007/s1035000702372 citation firstpage = 971 citation lastpage = 980 citation publication date = 2007/07/01 citation title = Detection of Metachronous Neoplasms in Colorectal Cancer Patients Identification of Risk Factors