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Preesman E, Drechsel K, Crommelin H, et al. Does luteal phase support in MOH-IUI treatment improve cumulative live birth rates in couples with unexplained subfertility? Study protocol of the LUMO study: a centre, randomised, double-blind, controlled trial with cost-effectiveness analysis. BMJ Open 2025;15:e111872. doi: 10.1136/bmjopen-2025-111872.