Figure 1.

PRISMA flowchart illustrating the entire selection process, from the literature search to the selection of studies of interest based on the inclusion and exclusion criteria

The screening process allows the rejection of duplicates and papers that do not meet the inclusion criteria based on titles and abstracts (i.e., language, year of publication, study design and participants). The eligibility process involves full-text analysis of the remaining papers based on specific outcome criteria, namely the setting and reporting of at least 2 of the following 3 aspects: activation criteria, donor safety or/and patient safety.