title: Unlock the door on youth problems: the adolescent from eleven to sixteen years. II.
mesh_terms: D000293:Adolescent; D002648:Child; D005260:Female; D006266:Health Education; D006801:Humans; D008297:Male; D000297:Psychology, Adolescent; D012922:Social Change; D012959:Socioeconomic Factors; D014481:United States