Vaqar, Abeer, et al. “EVALUATION OF ZINC STATUS OF PRESCHOOL CHILDREN AS ASSESSED BY HAIR ZINC LEVEL IN PUNJAB PROVINCE: Zinc Status of Preschool Children”. Pakistan Armed Forces Medical Journal, vol. 59, no. 4, Dec. 2009, pp. 440-4, https://pafmj.org/PAFMJ/article/view/1752.