Erratum for the Research Article "Liver homeostasis is maintained by midlobular zone 2 hepatocytes," by Y. Wei, Y. G. Wang, Y. Jia, L. Li, J. Yoon, S. Zhang, Z. Wang, Y. Zhang, M. Zhu, T. Sharma, Y.-H. Lin, M.-H. Hsieh, J. H. Albrecht, P. T. Le, C. J. Rosen, T. Wang, H. Zhu