. Author manuscript; available in PMC: 2018 Sep 7.
Published in final edited form as: Mucosal Immunol. 2018 Mar 7;11(4):1047–1059. doi: 10.1038/s41385-018-0014-7
Users may view, print, copy, and download text and data-mine the content in such documents, for the purposes of academic research, subject always to the full Conditions of use:http://www.nature.com/authors/editorial_policies/license.html#terms