Variations among emergency room populations: a comparison of four hospitals in New York City.
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D002675:Child, Preschool; D004636:Emergency Service, Hospital / Q000706:statistics & numerical data*; D005194:Family Practice; D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D008297:Male; D008875:Middle Aged; D009519:New York City; D010044:Outpatient Clinics, Hospital; D011153:Population; D012959:Socioeconomic Factors; D014947:Wounds and Injuries / Q000628:therapy