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.
Numbers of participants in magnetic resonance imaging and ultrasonography analyses. Historic fulfilment of American College of Rheumatology (ACR) 1987 criteria (classification) or diagnosis with rheumatoid arthritis (RA) by rheumatologist (diagnosis). MCP, metacarpophalangeal. MRI, magnetic resonance imaging; US, ultrasonography.
