Comparative Accuracy of Critical Care Pain Observation Tool (CPOT), Behavioral Pain Scale (BPS), and Non-verbal Pain Scale (NVPS) for Pain Assessment in Mechanically Ventilated Intensive Care Unit Patients: A Prospective Observational Study - Derlin Thomas; Anoob J Kuruppasseril; Rahmath A Samad; Edwin J George (Indian Journal of Critical Care Medicine, 2025)