Aalst, C.M. van der

screening cancer smoking lung cancer screening result lung cancer participant trial smoker health cessation smoking cessation study abstinence nelson follow-up smoking abstinence population behaviour nelson trial intervention control cancer screening impact questionnaire smoking behaviour randomised group effect lifestyle change nodules screen control arm test result subject ct screening round information nodule month baseline teachable moment cigarette chapter education level screening result colorectal volume respondent control arm participants difference sample number recruitment management analysis disease table moment netherland mortality research colorectal cancer screening smoking cessation intervention brochure smoking habits screen arm tomography history screening test result teachable chest lifestyle-related morbidity characteristic van der aalst smoking history intention people