CJCP     2018 20 (8):  652-657    ISSN: 1008-8830  CN: 43-1301/R A clinical and genetic analysis of a child with supernumerary marker chromosome 15-caused mental retardation, intractable epilepsy, and central precocious puberty GAO Zhi-Jie1, JIANG Qian2, CHEN Qian1, WANG Jing-Min3, PAN Hong4 Department of Neurology, Affiliated Children's Hospital of Capital Institute of Pediatrics, Beijing 100020, China Received: 2018-03-27  Revised: 2018-06-03  Online: null Supporting info