title: The contribution of natural support systems to primary prevention among four social subgroups of adolescent males.
mesh_terms: D000293:Adolescent; D003156:Community Mental Health Services; D006801:Humans; D008297:Male; D001523:Mental Disorders / Q000517:prevention & control*; D012931:Social Environment; D013315:Stress, Psychological; D019966:Substance-Related Disorders