Hollow-fiber liquid-phase microextraction and gas chromatography-mass spectrometry of barbiturates in whole blood samples - Menck, Rafael Almeida; Lima, Diógenes Saulo de; Seulin, Saskia Carolina; Leyton, Vilma; Pasqualucci, Carlos Augusto Gonçalves; Muñoz, Daniel Romero; Osselton, Michael David; Yonamine, Maurício (Journal of Separation Science, 2012)