Rheumatologists, dermatologists, and patient advocates have come together to publish the first-ever international guidelines for the treatment of psoriatic arthritis, a disease that mainly affects people who have psoriasis but also some people without it. The guidelines by the Group for Research and Assessment of Psoriasis and Psoriatic Arthritis (GRAPPA) were presented at the annual meeting of the American College of Rheumatology. The group was headed by Christopher Ritchlin, M.
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