Huang Yongcan, Chen Xiaohe, Wang Jia, Li Xiuqun, Xie Huiqi, Tang Li, Deng Li. Effects of hypoxia on human placental decidua basalis--mesenchymal stem cells proliferation,apoptosis and VEGF expression. Acta Physiol Sin 2008; 60 (6): 783-789 (in Chinese with English abstract).