Impact of posttransplant cyclophosphamide on the outcome of patients undergoing unrelated single-unit umbilical cord blood transplantation for pediatric acute leukemia oleh Xin-Yu Li, Li-Ping Zhan, Dian-Dian Liu, Xia-Wei Han, Han Chen, Zheng-Zhou Wu, Yin Wang, Li-Ping Que, Xiao-Jun Wu, Su Liu, Kai-Mei Wang, Shao-Liang Huang, Jian-Pei Fang, Ke Huang, Hong-Gui Xu