Correlation between Pre-procedural Ultrasound-estimated and Actual Procedural Epidural Depth in Lumbar Epidural Anaesthesia Taking BMI into Consideration: An Observational Study. - THOMAS, MINU; THOMAS, DERLIN; THOPPIL, JOHN VARGHESE; RAPHAEL, PAUL OVUNGAL; MATHEW, DEO (Journal of Clinical & Diagnostic Research, 2025)