Trends and mortality effects of vitamin A deficiency in children in 138 low-income and middle-income countries between 1991 and 2013: a pooled analysis of population-based surveys by Gretchen A Stevens, DSc, James E Bennett, PhD, Quentin Hennocq, MSc, Yuan Lu, DSc, Luz Maria De-Regil, DSc, Lisa Rogers, PhD, Goodarz Danaei, MD, Guangquan Li, PhD, Richard A White, PhD, Seth R Flaxman, BA, Sean-Patrick Oehrle, BA, Mariel M Finucane, PhD, Ramiro Guerrero, MSc, Prof. Zulfiqar A Bhutta, PhD, Amarilis Then-Paulino, MD, Prof. Wafaie Fawzi, MBBS, Prof. Robert E Black, MD, Prof. Majid Ezzati, FMedSci

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