Enantioselective determination of metoprolol acidic metabolite in plasma and urine using liquid chromatography chiral columns: applications to pharmacokinetics - Cerqueira, Paula Macedo; Boralli, Vanessa Bergamin; Coelho, Eduardo Barbosa; Lopes, Norberto Peporine; Guimarães, Luís Fernando Lopes; Bonato, Pierina Sueli; Lanchote, Vera Lúcia (Journal of Chromatography B, 2003)