The second sample set included 1255 NYCP individuals and 900 rheumatoid arthritis probands identified as part of multiple studies including NARAC [35], Wichita Rheumatic Disease Data Bank [36], the National Inception Cohort of Rheumatoid Arthritis Patients [36], and the Study Of New Onset Rheumatoid Arthritis [23]. In addition, for one analysis an additional 10 Swedish individuals were included. These individuals were as previously described [6]. Of the 1255 NYCP individuals, 500 overlapped with the first participant set.
