title: Observer error in medicine. Confessions of a reluctant measurer.
mesh_terms: D000397:Air Pollution; D000818:Animals; D001991:Bronchitis / Q000145:classification / Q000175:diagnosis; D003933:Diagnosis; D006168:Guinea Pigs; D000882:Haplorhini; D006801:Humans; D007600:Judgment; D008722:Methods; D011009:Pneumoconiosis / Q000145:classification / Q000175:diagnosis; D011656:Pulmonary Emphysema / Q000145:classification / Q000175:diagnosis; D013223:Statistics as Topic