Prediction rules must be developed according to methodological guidelines. Janssen KJ, Moons KG, Harrell FE (2010) Ann Intern Med 152: 263; author reply 263-4 Implementation of multidisciplinary care reduces maternal mortality in women with sickle cell disease living in low-resource setting. Asare EV, Olayemi E, Boafor T, Dei-Adomakoh Y, Mensah E, Ghansah H, Osei-Bonsu Y, Crabbe S, Musah L, Hayfron-Benjamin C, Covert B, Kassim AA, James A, Rodeghier M, DeBaun MR, Oppong SA (2017) Am J Hematol 92: 872-878 Pregnancy outcomes in women with sickle-cell disease in low and high income countries: a systematic review and meta-analysis. Boafor TK, Olayemi E, Galadanci N, Hayfron-Benjamin C, Dei-Adomakoh Y, Segbefia C, Kassim AA, Aliyu MH, Galadanci H, Tuuli MG, Rodeghier M, DeBaun MR, Oppong SA (2016) BJOG 123: 691-8
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