Mumtaz, Uzair, Hamid Javaid Qureshi, and Muhammad Usman Bashir. 2023. “Serum Zinc and Immunoglobulin G Levels in Lower and Upper / Upper Middle Socioeconomic Groups”. Esculapio Journal of SIMS 12 (4). Pakistan:166-69. https://doi.org/10.51273/esc16.71243.