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Mass SpectrometryBody Mass IndexSpectrometry, Mass, Electrospray IonizationTandem Mass SpectrometrySpectrometry, Mass, Matrix-Assisted Laser Desorption-IonizationTreatment OutcomeTime FactorsSurgical Procedures, OperativeRetrospective StudiesSurgical Procedures, Minimally InvasivePostoperative ComplicationsFollow-Up StudiesVascular Surgical ProceduresMolecular Sequence DataMethodsChromatography, High Pressure LiquidProspective StudiesSensitivity and SpecificityChromatography, LiquidAmino Acid SequenceCardiac Surgical ProceduresAmbulatory Surgical ProceduresOrthopedic ProceduresTomography, X-Ray ComputedMolecular WeightNeurosurgical ProceduresRisk FactorsGas Chromatography-Mass SpectrometryUrologic Surgical ProceduresReconstructive Surgical ProceduresAlgorithmsReoperationLaparoscopyMass ScreeningElectrophoresis, Polyacrylamide GelReproducibility of ResultsEndovascular ProceduresFontan ProcedureEquipment DesignCardiovascular Surgical ProceduresRadiography, InterventionalProteomicsObesityFluoroscopyBody CompositionSpectrometry, Mass, Secondary IonDigestive System Surgical ProceduresSurgical Procedures, ElectiveGynecologic Surgical ProceduresEvaluation Studies as TopicBody WeightFeasibility StudiesEndoscopyKineticsBase SequenceCattleCatheter AblationStentsRisk AssessmentProteinsUnited StatesPregnancyOral Surgical ProceduresCatheterizationMagnetic Resonance ImagingSpectrometry, Mass, Fast Atom BombardmentReference StandardsCalibrationAnalysis of VarianceAge FactorsChromatography, Ion ExchangeQuality ControlIndicators and ReagentsChromatography, GelPeptidesOphthalmologic Surgical ProceduresEscherichia coliChromatography, AffinityCohort StudiesRecurrencePredictive Value of TestsThoracic Surgical ProceduresRegression AnalysisLength of StayIntraoperative ComplicationsRadiology, InterventionalProteomeSurgical Procedures, MinorComputer SimulationHydrogen-Ion ConcentrationIsotope LabelingDiagnostic Techniques and ProceduresLiverInfant, NewbornLinear ModelsChromatographySurgery, Computer-AssistedAmino AcidsBiopsy, NeedleCardiac Catheterization