In vivo tracking of grape marc biomarkers, bioconversion, metabolic tracers, and microbiota modulation in swine fed a polyphenol-rich extract diet - Aly Castillo; Maria Celeiro; Beatriz Martínez-Vallespín; Laura Rubio; Diego Gonzalez-Iglesias; Rocío Facorro; Carmen Garcia-Jares; Jürgen Zentek; Marta Lores (PLoS ONE)