CJCP     2014 16 (9):  892-895    ISSN: 1008-8830  CN: 43-1301/R Clinical features and risk factors of co-morbid tic disorder in children with attention deficit hyperactivity disorder ZHOU Ke-Ying1, XIAO Zhi-Hui1, CHEN Yan-Zhao1, ZHANG Zhao-Xia1, LIU Zhi-Ping1, YANG Chun-He1, GAO Mei-Hao2 Department of Pediatrics, Shenzhen People's Hospital, Second Medical College of Jinan University, Shenzhen, Guangdong, 518020, China Received: 2014-06-23  Revised: 2014-07-19  Online: null Supporting info null