Randomized, comparative study of the effectiveness of three different techniques of interscalene brachial plexus block using 0.5% ropivacaine for shoulder arthroscopy

Michał Kolny

,

Michał J. Stasiowski

,

Marek Zuber

,

Radosław Marciniak

,

Ewa Chabierska

,

Aleksandra Pluta

,

Przemysław Jałowiecki

,

Tomasz Byrczek