title: Letter: Rates of creatinine and urea clearance in preterm infants on the 3rd day after birth.
mesh_terms: D003404:Creatinine / Q000378:metabolism*; D006801:Humans; D007231:Infant, Newborn; D007234:Infant, Premature; D008297:Male; D014508:Urea / Q000378:metabolism*; D014556:Urine
chemical_list: D014508:Urea; D003404:Creatinine