Estimating the incidence of rheumatoid arthritis: trying to hit a moving target?
Arthritis Rheum. 1999 Jul;42(7):1339-46. doi: 10.1002/1529-0131(199907)42:7<1339::AID-ANR6>3.0.CO;2-Y.
Arthritis Rheum. 1999.
PMID: 10403260
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