Acknowledgments
This study was supported by the National Natural Science Foundation of China (No.81472503). We thank Huizhen GENG, Jie ZHANG and Luping LI for their technical assistance and the development facility for their help in sorting the dendritic cells and myeloid-derived suppressor cellmyeloid cells. We also thank Prof. Zhen-yun Mou (Department of Statistics Research Office, Hebei Medical University) for his help with statistical analysis.