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BACKGROUND Electronic cigarettes (e-cigarettes) have become increasingly popular. China has accelerated its legislation on e-cigarettes in recent years by issuing two policies to regulate their use: the first on August 26, 2018, and the second on Nov
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2a1c8e67e5cbc96f5d62ae8651c1933a
https://doi.org/10.2196/preprints.19804
https://doi.org/10.2196/preprints.19804
Publikováno v:
Journal of Medical Internet Research. Oct2020, Vol. 22 Issue 10, pN.PAG-N.PAG. 1p. 4 Charts, 1 Map.