[1] Ahamed M, Siddiqui MKJ. Environmental lead toxicity and nutritional factors. Clin Nutr, 2007; 26, 400−8. doi:  10.1016/j.clnu.2007.03.010
[2] Egan KB, Cornwell CR, Courtney JG, et al. Blood lead levels in U. S. children ages 1-11 Years, 1976-2016. Environ Health Perspect, 2021; 129, 37003.
[3] Kolossa-Gehring M, Fiddicke U, Leng G, et al. New human biomonitoring methods for chemicals of concern-the German approach to enhance relevance. Int J Hyg Environ Health, 2017; 220, 103−12. doi:  10.1016/j.ijheh.2016.10.012
[4] Saravanabhavan G, Werry K, Walker M, et al. Human biomonitoring reference values for metals and trace elements in blood and urine derived from the Canadian Health Measures Survey 2007-2013. Int J Hyg Environ Health, 2017; 220, 189−200. doi:  10.1016/j.ijheh.2016.10.006
[5] Ruckart PZ, Jones RL, Courtney JG, et al. Update of the blood lead reference value - United States, 2021. MMWR Morb Mortal Wkly Rep, 2021; 70, 1509−12. doi:  10.15585/mmwr.mm7043a4
[6] Hahn D, Vogel N, Höra C, et al. The role of dietary factors on blood lead concentration in children and adolescents - Results from the nationally representative German Environmental Survey 2014-2017 (GerES V). Environ Pollut, 2022; 299, 118699. doi:  10.1016/j.envpol.2021.118699
[7] Burm E, Song I, Ha MN, et al. Representative levels of blood lead, mercury, and urinary cadmium in youth: Korean Environmental Health Survey in Children and Adolescents (KorEHS-C), 2012-2014. Int J Hyg Environ Health, 2016; 219, 412−8. doi:  10.1016/j.ijheh.2016.04.004
[8] Mostafa GA, El-Shahawi HH, Mokhtar A. Blood lead levels in Egyptian children from high and low lead-polluted areas: impact on cognitive function. Acta Neurol Scand, 2009; 120, 30−7.
[9] Liu XB, Zhang HD, Zhang Y, et al. The time trend of blood lead and cadmium levels in rural Chinese Children: China nutrition and health survey 2002 and 2012. Biol Trace Elem Res, 2023; 201, 2162−69. doi:  10.1007/s12011-022-03333-0
[10] Mathee A, Röllin H, Von Schirnding Y, et al. Reductions in blood lead levels among school children following the introduction of unleaded petrol in South Africa. Environ Res, 2006; 100, 319−22. doi:  10.1016/j.envres.2005.08.001