Esmail, Akram, Bahast Qadir, and Hawnaz Hamad. 2020. “Effect of Drinking Water Hardness on Kidney Stones Formation in Ranya District”. Cihan University-Erbil Scientific Journal 4 (1), 1-6. https://doi.org/10.24086/cuesj.v4n1y2020.pp1-6.