SuicideSuicide, AttemptedSuicidal IdeationAdolescent PsychologySuicide, AssistedAdolescent BehaviorGenes, Transgenic, SuicideFirearmsAdolescent DevelopmentSelf-Injurious BehaviorAdolescent Health ServicesRisk FactorsPoisoningAdolescent PsychiatrySex FactorsHomicideMental DisordersAdolescent MedicineAge FactorsWounds, GunshotQuestionnairesUnited StatesSubstance-Related DisordersDepressive DisorderCause of DeathPeer GroupCross-Sectional StudiesDepressionAsphyxiaSex DistributionAdolescent Nutritional Physiological PhenomenaGas PoisoningEuthanasiaParent-Child RelationsLongitudinal StudiesFamous PersonsSocioeconomic FactorsAttitude to DeathDepressive Disorder, MajorDrug OverdoseViolenceCoroners and Medical ExaminersPrevalenceAge DistributionParents