Haque, R., T. Ahmed, M. Wahed, D. Mondal, A. H. Rahman, and M. J. Albert. “Low-Dose β-Carotene Supplementation and Deworming Improve Serum Vitamin A and Β-Carotene Concentrations in Preschool Children of Bangladesh”. Journal of Health, Population and Nutrition, vol. 28, no. 3, July 2010, pp. 230-7, doi:10.3329/jhpn.v28i3.5549.