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To address this, the authors stratified all participants into three groups although the distinction between these three groups poses a challenge

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Massachusetts ($9.6) and New Hampshire ($8.3) are lower, while New York ($13.1), Maine ($12.5), Rhode Island ($10.9) and Vermont ($10.8) are higher

Acknowledgements The authors thank Johannes Traut, Isabell Keimer, and Sarah Schuhmann for coordination during the sample collection and Falko Wuensche and Stephanie Hammer for their incredible technical assistance and commitment to sample preparation and measurements

Chinese e-cigarette manufacturers like SMOK have upped their game, and today some of the prettiest and best machined mods are actually Chinese in origin