Is khat use disorder a valid diagnostic entity?

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Bibliographic Details
Title: Is khat use disorder a valid diagnostic entity?
Authors: Duresso, Samson W.1, Matthews, Allison J.1, Ferguson, Stuart G.1, Bruno, Raimondo1
Source: Addiction. Sep2016, Vol. 111 Issue 9, p1666-1676.
Database: SPORTDiscus with Full Text
Description
ISSN:09652140
DOI:10.1111/add.13421