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Alkema, Leontine and Chao, Fengqing and You, Danzhen and Pedersen, Jon and C Sawyer, Cheryl (2014) National, regional, and global sex ratios of infant, child, and under-5 mortality and identifi cation of countries with outlying ratios: a systematic assessment. The Lancet Global Health, 2 (9). e521-e530. ISSN 0140-6736