Determination of pindolol enantiomers in amniotic fluid and breast milk by high-performance liquid chromatography: applications to pharmacokinetics in pregnant and lactating women - Gonçalves, Paulo Vinicius Bernardes; Cavalli, Ricardo Carvalho; Cunha, Sérgio Pereira da; Lanchote, Vera Lúcia (Journal of Chromatography B, 2007)