title: Studies Need More than a Spot Sample: Variability of Urinary Metal Levels over Time.
authors.affiliation: Julia R. Barrett, MS, ELS, a Madison, WI-based science writer and editor, is a member of the National Association of Science Writers and the Board of Editors in the Life Sciences.
authors.forename: Julia R
authors.initials: JR
authors.lastname: Barrett
mesh_terms: D003404:Creatinine / Q000652:urine; D004781:Environmental Exposure; D008670:Metals; D013995:Time
chemical_list: D008670:Metals; D003404:Creatinine