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Deep eutectic solvent-based dispersive liquid-liquid microextraction coupled with HPLC and central composite design for biological monitoring of hippuric acid and methyl hippuric acid in urine. 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Since no direct sampling from human subjects or animal experimentation was performed by the authors, specific Institutional Review Board (IRB) ethical approval or animal welfare waivers were not required.","order":1,"name":"Ethics","label":"Ethics approval and source of biological material","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"The authors declare no competing interests.","order":2,"name":"Ethics","label":"Conflict of interest","group":{"name":"EthicsHeading","label":"Declarations"}}]}}