Identification of High Risk People for Colorectal Cancer and Evaluation of a Specific Surveillance System

"The letter will consist in several parts:~* Reminder of : -the need of individual follow-up for high risk people for colorectal cancer AND - the general recommendations (one colonoscopy every 5 years)~* Recommendation to consult their general practitioner or gastroenterologist if they haven't done their follow up~* Request information if they've done their follow-up or if we have incorrect information~* Indication that the letter is sent as part of a surveillance program specific for high risk people for colorectal Cancer"