title: A preschooler's expression of aggression in fantasy.
mesh_terms: D000374:Aggression; D001848:Bone Diseases, Developmental / Q000523:psychology / Q000601:surgery; D002675:Child, Preschool; D005201:Fantasy; D005269:Femur / Q000601:surgery; D006760:Hospitalization; D006801:Humans; D066298:In Vitro Techniques; D008297:Male