Biological activity of vascular endothelial cells of composite tissue cryopreserved with rapid-freezing versus slow-freezing methods  
Liu Yuan-xin1, Zhang Shu-ming2, Qiao Lin2, Huo Hai-tao2, Zhu Ze-xing2, Yuan Lei2
Chinese Journal of Tissue Engineering Research . 2012, (20): 3659 -3662 .  DOI: 10.3969/j.issn.1673-8225.2012.20.011