Family CharacteristicsFamilyFamily RelationsChild AbuseParent-Child RelationsParentsSocioeconomic FactorsResidence CharacteristicsRisk FactorsLogistic ModelsQuestionnairesCohort StudiesUnited StatesPhylogenyRNA, Ribosomal, 16SDNA, RibosomalSequence Analysis, DNADNA, BacterialBase CompositionGenes, rRNAMolecular Sequence DataBacterial Typing TechniquesSpecies SpecificityActinomycetalesFatty AcidsRNA, BacterialDNA, Ribosomal SpacerSeawater