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In response to your question on the prevalence of NPD, I've listed some research here: Dhawan, Kunik, Oldham, and Coverdale (2010) did a systematic review of literature on the prevalence and treatment of NPD from Jan 1980 to Aug 2008. Twenge and Foster (2010) updates a US based meta analysis of the prevalence of NPD among college students (based on ...

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