Liu L-Y, Hou Y-S, Chai J-K, Hu Q, Duan H-J, Yu Y-H, Yin H-N, Hao D-F, Feng G, Li T, et al. Basic fibroblast growth factor/vascular endothelial growth factor in the serum from severe burn patients stimulates the proliferation of cultured human umbilical cord mesenchymal stem cells via activation of Notch signaling pathways. J Trauma Acute Care Surg. 2013;75(5):789-97.