Changes in the prevalence of vaping and smoking among youth in Canada, England and the United States: repeat national cross-sectional surveys
David Hammond,Jessica Reid,Vicki Rynard,Geoffrey T Fong,K Michael Cummings,Ann Denise McNeill,Sara Christine Brenda Hitchman,James F Thrasher,Maciej L. Goniewicz,Maansi Bansal-Travers,Richard J O'Connor,David T. Levy,Ron Borland,Christine M. White BMJ(2019)
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