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causal domains, and involve family members in the intervention. (PROSPERO registration CRD42019114532). To explore differences in PET-CT service provision internationally to further understand the impact variation may have upon cancer services. To identify areas of further exploration for researchers and policymakers to optimise PET-CT services and improve the quality of cancer services. Comparative analysis using data based on pre-defined PET-CT service metrics from PET-CT stakeholders across 7 countries. This was further informed via document analysis of