Mohammed Ridha, Z. A. “Long-Term Follow up of Varus Osteotomy of the Femur in Patients With Perthes` Disease in Erbil City”. Zanco Journal of Medical Sciences (Zanco J Med Sci), vol. 24, no. 2, Aug. 2020, pp. 176-8, doi:10.15218/zjms.2020.021.