Magnesium DeficiencyMagnesium SulfateMagnesiumMagnesium OxideMagnesium CompoundsPhosphorusCalciumPhenolphthaleinsSpectrophotometry, AtomicHypocalcemiaErythrocytesPotassiumTrace ElementsApoprotein(a)Parathyroid HormoneHydrogen-Ion ConcentrationSodiumHypoparathyroidismCations, DivalentSerum AlbuminAdenosine TriphosphateKineticsElectrolytesSerumTime FactorsNucleic Acid Conformation