DyssomniasCase-Control StudiesRisk FactorsOdds RatioResearchGenetic Predisposition to DiseaseLogistic ModelsPolymorphism, Single NucleotideGenotypeAsia, WesternPolymorphism, GeneticEthiopiaIndiaRetrospective StudiesGene FrequencyHaplotypesSmokingRiskPregnancyMalaysiaExtraction, ObstetricalProspective StudiesResearch DesignAge FactorsQuestionnairesIncidenceResearch Support as TopicNepalChinaRisk AssessmentAllelesInfant, NewbornConfidence IntervalsMatched-Pair AnalysisBiological MarkersDiarrhea, InfantileCohort StudiesEthics, ResearchMultivariate AnalysisSeverity of Illness IndexFollow-Up StudiesItalyGreat BritainResearch PersonnelPrevalenceChi-Square DistributionLinkage DisequilibriumGenetic Association StudiesSex FactorsTurkeyTime FactorsAge of OnsetTreatment OutcomeRegression Analysis