CJCP     2015 17 (12):  1267-1272    ISSN: 1008-8830  CN: 43-1301/R Genetic and prenatal diagnosis for four families with Williams-Beuren syndrome LIU Yang1,2, XU Zhi-Yong2, WU Wei-Qing2, LUO Fu-Wei2, XIE Jian-Sheng2 Graduate School, Southern Medical University, Guangzhou 518010, China Received: 2015-07-17  Revised: 2015-08-27  Online: null Supporting info null