title: The transitional phenomenon revisited.
mesh_terms: D002657:Child Development; D002675:Child, Preschool; D004328:Drive; D004532:Ego; D006801:Humans; D008297:Male; D009769:Object Attachment; D010554:Personality Disorders / Q000209:etiology; D011574:Psychoanalytic Theory; D012094:Repression, Psychology