Mass SpectrometryIntensive Care UnitsBody Mass IndexSpectrometry, Mass, Electrospray IonizationTandem Mass SpectrometryHospital UnitsSpectrometry, Mass, Matrix-Assisted Laser Desorption-IonizationIntensive Care Units, NeonatalIntensive Care Units, PediatricMolecular Sequence DataCoronary Care UnitsAmino Acid SequenceChromatography, LiquidTime FactorsChromatography, High Pressure LiquidBody CompositionMolecular WeightObesitySpectrometry, Mass, Secondary IonMass ScreeningRespiratory Care UnitsProteomicsProspective StudiesGas Chromatography-Mass SpectrometryBody WeightSpectrometry, Mass, Fast Atom BombardmentBase SequenceRisk FactorsMuscle, SkeletalBurn UnitsIntensive CareElectrophoresis, Polyacrylamide GelRetrospective StudiesSensitivity and SpecificityMotor NeuronsRecruitment, NeurophysiologicalKineticsCloning, MolecularCarbohydrate SequencePeptidesMobile Health UnitsMagnetic Resonance SpectroscopyTreatment OutcomeInfant, NewbornProteomeAbsorptiometry, PhotonAdipose TissueTomography, X-Ray ComputedHemodialysis Units, HospitalProteinsCross-Sectional StudiesCohort StudiesHydrogen-Ion ConcentrationMolecular StructureRecombinant ProteinsOrgan SizeMass MediaEscherichia coliMass Casualty IncidentsModels, BiologicalCattlePregnancyRegression AnalysisAnthropometryAlgorithmsCrystallizationBone DensityCritical IllnessPeptide MappingLinear ModelsFollow-Up StudiesAge FactorsInternational System of UnitsElectrophoresis, Gel, Two-DimensionalSequence Homology, Amino AcidBacterial ProteinsLength of StayOligosaccharidesChromatography, GelCross InfectionPeptide FragmentsCritical CareElectromyographySubstrate SpecificityAnalysis of VarianceHypertrophy, Left VentricularEnergy MetabolismCarbohydrate ConformationReference ValuesMuscle ContractionSex FactorsMusclesMass VaccinationModels, MolecularAgingMagnetic Resonance ImagingChromatography, Ion ExchangeCalibrationPredictive Value of TestsSpecies Specificity