Barton, Richard M <br/><br/>
Not as simple as it looks.  [electronic resource] 

 -  Regional anesthesia and pain medicine   
 - 73 p.  digital 
<br/><br/> Publication Type: Letter; Comment 
<br/><br/><label>ISSN: </label>1532-8651 
<br/><br/><label>Standard No.: </label>10.1097/AAP.0b013e3182754e4e  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Brachial Plexus--diagnostic imaging<br/>Humans<br/>Nerve Block--methods<br/>Ultrasonography, Interventional--methods