. Author manuscript; available in PMC: 2021 Jul 20.
Published in final edited form as: Vaccine. 2015 Sep 26;33(47):6453–6465. doi: 10.1016/j.vaccine.2015.08.043
This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Fig. 1.
Systematic review workflow.