test (1) mise sous écran protecteur (1) risque (1) association (1) mortalité (1) exposition (1) effet (1) cancer (1) Testing (1) Mortality (1) Case (1) Control (1) Cancer (1) Death (1) Rectum--Cancer (1) Windows (1) Tumors (1) Testing (1) Social groups (1) Sigmoidoscopy (1) Risk (1) Persons (1) Patients (1) Mortality (1) Grammar, Comparative and general--Case (1) Endoscopy (1) Design (1) Death (1) Dates (Fruit) (1) Confidence (1)