Articles were evaluated based on their title and abstract, and those deemed relevant were further assessed in full text. If there was a disagreement about the relevance of an article, it was resolved by a third, independent author (AVM). The articles were included in the data extraction and analysis if the diagnosis was based on the following criteria: (a) a compatible cutaneous presentation, (b) localized arthritis/polyarthralgia, (c) a history of gastrointestinal disease, and (d) the absence of an alternative diagnosis.
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