Siegel, E. H.; Kordas, K.; Stoltzfus, R. J.; Katz, J.; Khatry, S. K.; LeClerq, S. C.; Tielsch, J. M. Inconsistent Effects of Iron-Folic Acid and/Or Zinc Supplementation on the Cognitive Development of Infants. J Health Popul Nutr 2012, 29, 593-604.