Letrozole versus clomifene, with or without metformin, for ovulation induction in women with polycystic ovary syndrome (LOCI): a multicentre, 2x2 factorial design, randomised controlled trial. - Melo, P.; Dhillon-Smith, R.; Priest, L.; Mitchell, G.; Nnamani, P.; Cheed, V.; Middleton, L.; Vigneswaran, K.; Devall, A.; Coomarasamy, A. (Human Reproduction, 2026)