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.
Flowchart for patients screening. A: Total dermatomyositis cohort was the final studied patients, which were divided into observation (malignant) and control (nonmalignant) groups. B: Malignant patients were the observation group, who acted as the basis for randomly selecting nonmalignant patients according to age and gender in a ratio of 1:2.
