Comparison of Diaphragmatic Paralysis, Respiratory Function and Postoperative Pain After Interscalene Brachial Plexus Block With a Reduction Dose of Levobupivacaine 0.25% 10 ml Versus 20 ml Undergoing Arthroscopic Shoulder Surgery: Study Protocol for the Randomized, Controlled and Double-blinded REDOLEV Study. | Publicación