J. pharm. biomed. anal. J. pharm. biomed. anal. Determination of total plasma oxysterols by enzymatic hydrolysis, solid phase extraction and liquid chromatography coupled to mass-spectrometry Mendiara Isabel Universidad de Zaragoza Domeño Celia Universidad de Zaragoza Nerín Cristina Universidad de Zaragoza Geurts Aron M. Osada Jesús Universidad de Zaragoza Martínez-Beamonte Roberto Universidad de Zaragoza 2018 research-article