Ghaffar, A., M. M. Alam, W. Akhtar, Ishrat Fatima, Muhammad Burhan, and Muhammad Mustafa Gul. “Correlation of Numeric Pain Rating Scale and Oswestry Disability Index of Non-Specific Low Back Pain Among Nursing Staff”. Journal of Health and Rehabilitation Research, vol. 3, no. 2, Dec. 2023, pp. 935-40, doi:10.61919/jhrr.v3i2.237.