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Amaefule, Chiamaka Esther ORCID: https://orcid.org/0000-0003-3864-2642, Bolou, Angeliki ORCID: https://orcid.org/0000-0002-8606-2805, Drymoussi, Zoe, Gonzalez Carreras, Francisco Jose ORCID: https://orcid.org/0000-0002-3043-7495, Pardo Llorente, Maria del Carmen, Lanz, Doris ORCID: https://orcid.org/0000-0001-9879-3069, Dodds, Julie, Sweeney, Lorna, Pizzo, Elena, D’Amico, Maria, Thomas, Amy, Heighway, James, Daru, Jahnavi ORCID: https://orcid.org/0000-0001-5816-2609, Sobhy, Soha, Robson, John, Sanghi, Anita, Zamora, Javier, Harden, Angela, Hitman, Graham, Khan, Khalid, Pérez, Teresa, Huda, Mohammed SB and Thangaratinam, Shakila (2020) Effectiveness and acceptability of metformin in preventing the onset of type 2 diabetes after gestational diabetes in postnatal women: a protocol for a randomised, placebo-controlled, doubleblind feasibility trial — Optimising health outcomes with Metformin to prevent diAbetes After pregnancy (OMAhA). BMJ Open, 10 (5):e036198. ISSN 2044-6055 (Online) (doi:10.1136/bmjopen-2019-036198)