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BackgroundChronic plaque psoriasis can be subdivided into two groups according to the age of onset: type 1 (early onset, before 40 years) and type 2 (late onset, at or beyond 40 years). So far, 36 genetic loci have been associated with early‐onset psoriasis in genome‐wide association studies of white populations, while few studies have investigated genetic susceptibility to late‐onset psoriasis.
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