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| - To test for hypersensitivity to azo dye and drugs such as nonsteroidal anti-inflammatory drugs (NSAIDs), skin testing and open oral challenge tests with Tartrazine (FD&C Yellow No.5, Wako Pure Chemical, Osaka, Japan), Brilliant blue No.1 FCF (FD&C Blue No.1, Kyoritsu Foods, Tokyo, Japan), p-Hydroxybenzoic acid (Wako Pure Chemical, Osaka, Japan), aspirin, and acetaminophen were performed under clos
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