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Protocol identifies gaps in evidence for health interventions to reduce out-of-pocket expenses, suggesting further studies are needed.
This is a protocol for a Campbell Evidence and Gap Map (EGM) of the studies of the effect of health interventions to reduce out-of-pocket expenses (OOPE). The objective is to identify existing gaps in the available evidence where further primary studies and systematic reviews are needed.
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Li et al. (2026) studied this question.
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