Retrospective StudiesObservational Study as TopicObservationProspective StudiesTreatment OutcomeRisk FactorsTime FactorsFollow-Up StudiesCohort StudiesMulticenter Studies as TopicSeverity of Illness IndexIncidenceDouble-Blind MethodInfant, NewbornRandomized Controlled Trials as TopicRisk AssessmentPrognosisIntensive Care UnitsEuropePregnancy