Hospitals, PackagedKorean WarAcute DiseasePurpura, Thrombotic ThrombocytopenicHemoglobin SC DiseaseHemolytic-Uremic SyndromeRecurrenceFollow-Up StudiesTime FactorsChronic DiseaseHospitals, TeachingProspective StudiesAsthmaHospitals, GeneralSeverity of Illness IndexHospitals, UniversityRisk FactorsTreatment OutcomeHospital CostsEpisode of CareHospitals, UrbanNursing Staff, HospitalEconomics, HospitalHospitals, PediatricHospital Bed CapacityHospitals, SpecialHospitals, DistrictHospitals, PrivateRetrospective Studies