Osteogenesis and vascularization of bone marrow mesenchymal stem cells transfected by pcDNA3/hVEGF165 combined with freeze-dried cancellous bone in vivo Chinese Journal of Tissue Engineering Research . 2011, (25): 4561 -4564 .  DOI: 10.3969/j.issn.1673-8225.2011.25.001