To use or not to use: an update on licit and illicit ketamine use.

Subst Abuse Rehabil · 2011 · PMC3846302 · PMID 24474851

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an increasing trendno p-value reported

6 In addition, an increasing trend of illicit ketamine use has also been reported in China, Malaysia, and Taiwan. 4 , 7 , 8 Illicit ketamine use may occur alone or in combination with other drugs.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.