A., Khongorzul, Suwd G, Suwd J, Altanzul B, Bolortuya K, and Purewdorj B. 2013. “The Study of Correlation Between Intellectual Impairment and Blood Lead Level Among 6 to 8 Years Old Children in Ulaanbaatar”. Journal of Asian Medical Students’ Association 2 (3). Kuala Lumpur, Malaysia. https://jamsa.amsa-international.org/index.php/main/article/view/26.