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'review': [149], '(T.': [150], 'W.': [151], 'Hesterberg': [152], 'et': [153], 'al.;': [154], 'Environ.': [155], 'Sci.': [156], 'Technol.': [157], '2008,': [158], '42,': [159], '6437-6445),': [160], 'numerous': [161], 'characterization': [163], 'demonstrated': [166], 'marked': [167], 'differences': [168, 244], 'regulated': [170], 'unregulated': [172], 'between': [174, 197, 248], '"traditional': [177], 'exhaust"': [179], '(TDE)': [180, 331], 'engines.': [184, 225], 'Now': [185], 'there': [186, 274], 'exist': [187], 'even': [188], 'more': [189, 344], 'data': [190, 229, 263, 366], 'demonstrating': [191], 'significant': [192], 'chemical': [193, 238, 308], 'physical': [195, 236, 306], 'distinctions': [196], '(DEP)': [202], 'versus': [205, 250], 'DEP': [206], 'pre-2007': [208, 286], 'technology,': [210], 'its': [212], 'greater': [213], 'resemblance': [214], 'compressed': [219, 350], 'natural': [220, 351], 'gas': [221, 352], '(CNG)': [222, 353], 'gasoline': [224, 355], 'Furthermore,': [226], 'preliminary': [227], 'toxicological': [228, 391], 'suggest': [230], 'changes': [233], 'composition': [239], 'lead': [242], 'biological': [246], 'responses': [247], 'TDE': [251], 'exposure.': [252], 'Ongoing': [253], 'are': [255, 367, 386], 'expected': [256], 'address': [258], 'some': [259], 'remaining': [262], 'gaps': [264], 'understanding': [267], 'possible': [269], 'effects,': [272], 'but': [273], 'now': [276], 'sufficient': [277, 363], 'evidence': [278], 'conclude': [280], 'effects': [283, 325, 365], 'likely': [288], 'little': [290, 338], 'relevance': [291, 339], 'assessing': [293], 'potential': [295], 'risks': [297], 'exposures.': [300], 'IMPLICATIONS': [301], 'Based': [302], 'distinct': [305], 'properties': [309], 'Exhaust': [314], '(NTDE),': [315], 'it': [316, 371], 'become': [318], 'clear': [319], 'findings': [321], 'traditional': [329, 360], 'last': [334], 'years': [336], 'NTDE,': [341, 370], 'which': [342], 'similar': [345], 'than': [358], 'TDE.': [361], 'Once': [362], 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