title: Comparison of the doubly labeled water (2H2 18O) method with indirect calorimetry and a nutrient-balance study for simultaneous determination of energy expenditure, water intake, and metabolizable energy intake in preterm infants.
mesh_terms: D002151:Calorimetry; D003903:Deuterium; D004734:Energy Metabolism; D006801:Humans; D007227:Infant Nutritional Physiological Phenomena; D007231:Infant, Newborn; D007234:Infant, Premature / Q000378:metabolism*; D008433:Mathematics; D008954:Models, Biological; D010103:Oxygen Isotopes; D014867:Water / Q000378:metabolism*
chemical_list: D010103:Oxygen Isotopes; D014867:Water; D003903:Deuterium