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Rheumatoid arthritis (RA) is a systemic inflammatory chronic disease of unknown origin that mainly affects adult women and tends to be more prevalent in the oldest group of people [1]. Fascinating facts have been seen during its history and many hypotheses have been raised on when it appeared, how it affects human beings and some interesting epidemiological findings and trends [2]. It is universally distributed and there is no ethnic group who have been described without it. Nevertheless, there is prominent information related to an unequal distribution of this potentially disabling disease around the world.
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Martin et al. (2011) studied this question.
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