Current prevalence of attention deficit hyperactivity disorder   among children: a  metaanalysis
Li Fulun， Xie Qingmu， Zhao Qianlong， Cheng Junyi， Wei Shuizhen， Li Aishu，
Clinical Focus . 2017, (12): 1079 -1083 .  DOI: 10.3969/j.issn.1004-583X.2017.12.015