Comparison of the effectiveness of ultrasound-guided versus fluoroscopy-guided medial lumbar bundle branch block on pain related to lumbar facet joints: a multicenter randomized controlled non-inferiority study. - Nisolle, Marie-Laure; Ghoundiwal, Djamal; Engelman, Edgard; El Founas, Walid; Gouwy, Jonathan; Guntz, Emmanuel; Kapessidou, Panayota; Tuna, Turgay (BMC Anesthesiology, 2023)