title: A new way to control experiments.
mesh_terms: D016022:Case-Control Studies; D004198:Disease Susceptibility / Q000209:etiology; D004781:Environmental Exposure; D004785:Environmental Pollutants / Q000009:adverse effects*; D020022:Genetic Predisposition to Disease; D005828:Genetics, Population; D006801:Humans; D018579:Patient Selection; D013315:Stress, Psychological; D011795:Surveys and Questionnaires
chemical_list: D004785:Environmental Pollutants