Fig. 2.
11-point visual analogue scale to assess and quantify how difficult subjects found the task of aspirating 1 ml of synthetic blood using the longitudinal approach
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.