Mental health and population density.
D000293:Adolescent; D000328:Adult; D003214:Conditioning, Classical; D004644:Emotions; D005006:Ethnicity; D006760:Hospitalization; D006801:Humans; D001523:Mental Disorders / Q000453:epidemiology* / Q000209:etiology; D008875:Middle Aged; D008910:Minnesota; D009294:Narcotics; D009519:New York City; D010551:Personality; D011156:Population Density; D011157:Population Dynamics; D011678:Punishment; D012424:Rural Population; D012937:Social Mobility; D013312:Stress, Physiological; D019966:Substance-Related Disorders / Q000453:epidemiology* / Q000209:etiology; D014505:Urban Population
D009294:Narcotics