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A study of two Chinese patients with tetrasomy and pentasomy 15q11q13 including Prader-Willi/Angelman syndrome critical region present with developmental delays and mental impairment

Jing Yang, Yongchen Yang, Yi Huang, Yan Hu, Xi Chen, Hengjuan Sun, Zhibao Lv, Qian Cheng* and Liming Bao*

BMC Medical Genetics 2013, 14:9  doi:10.1186/1471-2350-14-9