Fluid TherapyIsotonic SolutionsInfusions, ParenteralDehydrationHyponatremiaInfusions, IntravenousSodium ChlorideDiarrheaBody FluidsProspective StudiesBlood VolumePlasma VolumeStroke VolumeLung Volume MeasurementsErythrocyte VolumeBlood Volume DeterminationMagnetic Resonance ImagingForced Expiratory VolumeSynovial FluidImaging, Three-DimensionalOrgan SizeTime FactorsResidual Volume