Fig. 2From: Strengthening vaccination delivery system resilience in the context of protracted humanitarian crisis: a realist-informed systematic reviewPRISMA flowchart describing the results of the screening and article selection process. In this review, the selection process is described in two flows; one relating to peer-reviewed literature sourced through formal databases (the left-hand stream), and one describing selection of peer-reviewed, grey and other sources identified through searches of organisational and other websites relevant to vaccination delivery (right-hand stream)Back to article page