Li G, Che M-T, Zhang K, Qin L-N, Zhang Y-T, Chen R-Q, Rong L-M, Liu S, Ding Y, Shen H-Y, et al. Graft of the NT-3 persistent delivery gelatin sponge scaffold promotes axon regeneration, attenuates inflammation, and induces cell migration in rat and canine with spinal cord injury. Biomaterials. 2015;83:233-248.