 All content is also deposited in PubMed Central, where it is available to the public six months after publication.Copyright to articles remains with the authors and third parties may re-use content after 6 months under the terms of a Creative Commons Attribution-Noncommercial-Share Alike 3.0 Unported license.According to the "Journal Citation Reports", the journal received a 2017 impact factor of 10.790, ranking it eight out of 155 journals in the category "Immunology" and sixth out of 133 journals in the category "Medicine, Research & Experimental".