. Author manuscript; available in PMC: 2017 Jan 13.
Published in final edited form as: Cell Mol Gastroenterol Hepatol. 2017 Jan;3(1):99–118. doi: 10.1016/j.jcmgh.2016.09.009
This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).