Nasreen, F., Khalid, A., Zafar, L., Ahmed, S.A. and Shaikh, A. 2023. Frequency of secondary modifiers in Beta Thalassemia intermedia in patients from Northern Punjab. Pakistan Journal of Medical Sciences. 39, 5 (Aug. 2023). DOI:https://doi.org/10.12669/pjms.39.5.7376.