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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
Typical chromatograms for the determination of standard GEF (450 ng/mL), GEF in patient plasma sample and GEF in spiked human plasma samples containing 150, 450 and 600 ng/mL by the proposed method.