Video 2.
Download video file (182.2KB, mp4)
DOI: 10.1136/bcr-2019-232756.video02
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.