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The aroma produced by e-cigarettes comes from the flavor ingredients in the e-liquid, which includes propylene glycol or vegetable glycerin, or both, as well as nicotine and flavor

The levels of these three polyamines all decreased from S4 to S5, thus suggesting the acceleration of leaf senescence

We thank professor Michael Scott (Indiana University Bloomington) for help in improving the English writing

Assessment of LV and RV diastolic function was performed using Tissue Doppler indices, but further studies on invasively determined measures of ventricular function are needed

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