Comparison of osteogenesis between the recombinant human vascular endothelial growth factor 165/recombinant human bone morphogenetic protein 2/deproteinized bone and deep frozen bone  Chinese Journal of Tissue Engineering Research . 2012, (20): 3611 -3615 .  DOI: 10.3969/j.issn.1673-8225.2012.20.001