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D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D003933:Diagnosis; D006761:Hospitals / Q000706:statistics & numerical data*; D006801:Humans; D007902:Length of Stay; D008875:Middle Aged; D010351:Patient Discharge / Q000706:statistics & numerical data; D013514:Surgical Procedures, Operative; D014481:United States / Q000453:epidemiology