Associations of serotonin transporter gene promoter polymorphisms and monoamine oxidase A gene polymorphisms with oppositional defiant disorder in a Chinese Han population oleh Chang-Hong Wang, Qiu-Fen Ning, Cong Liu, Ting-Ting Lv, En-Zhao Cong, Jing-Yang Gu, Ying-Li Zhang, Hui-Yao Nie, Xiao-Li Zhang, Yan Li, Xiang-Yang Zhang, Lin-Yan Su