visit_to_asia,either_turb_or_lung_cancer
visit_to_asia,positive_xray
visit_to_asia,dyspnoea
tuberculosis,positive_xray
tuberculosis,dyspnoea
smoking,either_turb_or_lung_cancer
smoking,positive_xray
smoking,dyspnoea
lung_cancer,positive_xray
lung_cancer,dyspnoea