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Attention Deficit Hyperactivity Disorder comorbid oppositional defiant disorder and its predominately inattentive type: evidence for an association with COMT but not MAOA in a Chinese sample

Qiu-Jin Qian, Jin Liu, Yu-Feng Wang*, Li Yang, Li-Li Guan and Stephen V Faraone

Behavioral and Brain Functions 2009, 5:8  doi:10.1186/1744-9081-5-8