Fig 1. Flow chart showing selection procedures into the study.
CMP: chronic musculoskeletal pain. aPercentage of N = 7,520 trios. bPercentage of 9,509 trios.
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.