Continuous interscalene brachial plexus block via an ultrasound-guided posterior approach: A randomized, triple-masked, placebo-controlled study

Edward R. Mariano, Robert Afra, Vanessa J. Loland, Navparkash S. Sandhu, Richard H. Bellars, Michael L. Bishop, Gloria S. Cheng, Lynna P. Choy, Rosalita C. Maldonado, Brian M. Ilfeld