Global, regional, and national levels of maternal mortality, 1990-2015: a systematic analysis for the Global Burden of Disease Study 2015 - Kassebaum, N J; Barber, R M; Dandona, L; Gething, P W; Hay, S I; Kinfu, Y; GBD 2015 Maternal Mortality Collaborators (Lancet, 2016)
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