surveillance (1) mise sous écran protecteur (1) risque (1) recommandation (1) association (1) opinion (1) histoire (1) dosage (1) maladie (1) investigation (1) âge (1) cancer (1) canal (1) jeune (1) Diagnosis (1) History (1) Cancer (1) Rectum--Cancer (1) Inflammatory bowel diseases (1) Specialists (1) Dysplasia (1) Ultrasonic imaging (1) Ulcerative colitis (1) Symptoms (1) Social groups (1) Risk (1) Population (1) Patients (1) Methylene blue (1) Measurement (1)