Afsheen Mehmood, Anwar Ul Haq, Khalid Shahab, Hameed Ullah, Muhammad Irfan, Farhan Zeb, “Kell Blood Group System Antigen Genotypic Frequencies in Northern Pakistani Healthy Blood Donors a Multi Center Study”, Pakistan Journal of Medical & Health Sciences, vol. 17, no. 01, p. 698, Mar. 2023.