Karez Namiq Kakarash, and Vian Afan Naqshbandi. 2023. “Comparison Between the Effectiveness of McKenzie Extension Exercises and William Flexion Exercises for Treatment of Acute or Sub-Acute Low Back Pain”. Journal of Population Therapeutics and Clinical Pharmacology 30 (8):123-33. https://doi.org/10.47750/jptcp.2023.30.08.013.