5.
Fabregat G, Roselló M, Asensio-Samper JM, Villaneuva-Pérez VL, Martínez-Sanjuan V, De Andrés J, Eichenberger U. Computer-tomo-graphic verification of ultrasound-guided piriformis muscle injection: a feasibility study. Pain Physician. 2014; 17(6): 507-13.