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Liquid chromatography and mass spectrometry conditions Analyses of urinary nicotine, cotinine and NNAL were conducted using an HPLC (UltiMate 3000, Thermo Fisher Scientific, Yokohama, Japan) coupled to a hybrid quadrupole-Orbitrap mass spectrometer (Thermo Scientific Q Exactive Focus) with heated electrospray ionization (HESI-II)

Extreme and unusual weather events are becoming more frequent and may affect your travel plans

With proper care and attention, you can have both a captivating head of hair and an enjoyable vaping experience

We appreciate every supporter from the local health administrations, health education institutes, centers for disease control and prevention, and primary care institutions across 31 provinces in China who contributed to the China Health Literacy Survey

This initiative was created by the Department of Health and Human Services