Kiani, Asma Afzal, et al. “Comparison of Haller Index Values Calculated With Chest Radiographs Versus Computed Tomography for Pectus Excavatum Evaluation”. Pakistan Armed Forces Medical Journal, vol. 74, no. 1, Feb. 2024, pp. 216-9, https://doi.org/10.51253/pafmj.v74i1.7465.