Comparison Of Skin To Epidural Space Distance Using BMI-Derived Predictive Equation Versus Ultrasound Guidance In Elective Surgery Patients: A Prospective Randomized Study. Int. J. Environ. Sci. [Internet]. 2025 Jun. 2 [cited 2025 Sep. 14];:1307-16. Available from: http://theaspd.com/index.php/ijes/article/view/3076