Correction: Macrophage Migration Inhibitory Factor Inhibits the Migration of Cartilage End Plate-Derived Stem Cells by Reacting with CD74

• Cheng-jie Xiong, 
• Bo Huang, 
• Yue Zhou, 
• Yan-ping Cun, 
• Lan-tao Liu, 
• Jian Wang, 
• Chang-qing Li, 
• Yong Pan, 
• Hai Wang