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B Piel, Frédéric and J Tatem, Andrew and Huang, Zhuojie and Gupta, Sunetra and N Williams, Thomas and J Weatherall, David (2014) Global migration and the changing distribution of sickle haemoglobin: a quantitative study of temporal trends between 1960 and 2000. The Lancet Global Health, 2 (2). e80-e89. ISSN 0140-6736