Where the Cost of Endometriosis Falls: Research Plan of a Narrative Review with Systematic Search and a Europe-Wide Cost-of-Illness Model (Retrospective Registration)

Retrospective registration, submitted after the study was completed (literature searches executed 21 July 2026). Research plan, as executed, of a narrative review with systematic search on the micro- and macroeconomic burden of endometriosis, and of a prevalence-based cost-of-illness model for 31 European countries. The review was not prospectively registered; this record cannot demonstrate pre-specification and contains no results. Model code and data: https://doi.org/10.5281/zenodo.23834921