The CCP antibody test helps to diagnose RA and can be useful in identifying people with a more rapidly erosive form of the disease. RA is a chronic, systemic autoimmune disease that causes inflammation, pain, stiffness, and destructive changes in the hands, feet, and other joints throughout the body.
As you can see from the map above, most of the Illinois population is based in the North East of the state. Chicago, home to 2,695,598 people, remains the largest city in Illinois. It dwarfs the state's other cities â the next largest is Aurora, with 197,899 people.
Today, Chicago the city makes up only just over a quarter of the wider Chicago-Joilet-Naperville Metropolitan Area's population. According to data from the 2010 census, the CJN Metro Area is home to an impressive 9,504,753 people. In 2016, this number is estimated to be around 9,554,598.