Figure 1.
Flowchart. *One case lost in the ultrasound-guided method group. **One patient did not receive the intervention because of clinical deterioration.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.