Emergency RespondersEmergency Medical TechniciansRescue WorkPoliceMass Casualty IncidentsEmergency Medical Service Communication SystemsDisaster PlanningEmergency Medical ServicesCardiopulmonary ResuscitationDefibrillatorsSeptember 11 Terrorist AttacksAllied Health PersonnelSmallpox VaccineHeart ArrestTreatment OutcomeGenes, MHC Class IIImmunogeneticsTime FactorsT-LymphocytesOvulation InductionLymphocyte Culture Test, MixedProspective StudiesMice, Inbred StrainsAntibody FormationInterferon-alphaLymphocyte ActivationPredictive Value of TestsDrug Administration ScheduleFollow-Up StudiesDrug Therapy, CombinationRetrospective StudiesDouble-Blind MethodTreatment FailureQuestionnairesPrognosis