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Peter Christian,6,7,9,10 William Howell,7,10 and Craig P Stewart8,11. Departments of 6Nutrition, 7Global Health and Population, and 8Biostatistics, Harvard School. of Public Health, Boston, MA. 1This article was presented in abstract form at the 46th Society for Epidemiologic Research. Annual Meeting, Boston, MA, 18–21 June 2013. ................
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