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. Author manuscript; available in PMC: 2019 Sep 1.
Published in final edited form as: Drug Alcohol Depend. 2018 Jun 23;190:1–5. doi: 10.1016/j.drugalcdep.2018.05.018

Fig. 1.

Fig. 1.

Prevalence of Topics.

Note: The bold diagonal line indicates the prevalence of the 11 topics identified. The off-diagonal lines indicate topic overlap. For example, a hypothetical post such “I lost my JUUL at recess” could be classified under Lost & Found and School. The number of posts containing both content would be found at the intersection of the matrix for these two topics or 0.03%.