Human umbilical cord mesenchymal stem cells to treat spinal cord injury in the early chronic phase: study protocol for a prospective, multicenter, randomized, placebo-controlled, single-blinded clinical trial
Yang Yang, Mao Pang, Yu-Yong Chen , Liang-Ming Zhang , Hao Liu , Jun Tan , Bin Liu, Li-Min Rong
Neural Regeneration Research . 2020, (8): 1532 -1538 .  DOI: 10.4103/1673-5374.274347