Incidence of Extraarticular Rheumatoid Arthritis in Olmsted County, Minnesota, in 1995-2007 Versus 1985-1994: A Population-based Study.
OBJECTIVE: To assess incidence and mortality effects of extraarticular rheumatoid arthritis (ExRA) in patients with incident RA in 1995-2007 compared to 1985-1994, in Olmsted County, Minnesota, USA. METHODS: Data on incident ExRA were abstracted from medical records of patients with RA - Olmsted County residents who first met the 1987 American College of Rheumatology criteria for RA between Januar
