Intermittent Positive-Pressure VentilationVentilator WeaningHigh-Frequency VentilationWork of BreathingRespiration, ArtificialRespiratory Distress Syndrome, NewbornInfant, Very Low Birth WeightInfant, PrematureInfant, NewbornMandatory TestingVentilationMandatory ProgramsPulmonary VentilationMandatory ReportingTidal VolumePositive-Pressure RespirationHigh-Frequency Jet VentilationNoninvasive VentilationRespirationRespiratory MechanicsVentilators, MechanicalPulmonary Gas ExchangeCarbon DioxideVentilation-Perfusion RatioIntubation, Intratracheal