AUTHOR= Frontiers Editorial Office TITLE=Expression of Concern: Simultaneous extraction and preliminary purification of polyphenols from grape pomace using an aqueous two-phase system exposed to ultrasound irradiation: process characterization and simulation JOURNAL=Frontiers in Nutrition VOLUME=11 YEAR=2024 URL=https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2024.1450415 DOI=10.3389/fnut.2024.1450415 ISSN=2296-861X