Meenakshi, Meenakshi, and Khushbu Khushbu. “Effectiveness of Pain Assessment Tools in Non-Verbal ICU Patients: A Meta-Analysis-Based Review”. International journal of health sciences 9, no. S1 (July 21, 2025): 411–423. Accessed May 4, 2026. http://www.sciencescholar.us/journal/index.php/ijhs/article/view/12295.