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4. Is p-phenylenediamine (PPD) a better marker of contact allergy to PPD-based hair dyes than its salt PPD dihydrochloride? Young E; Svedman C; Zimerson E; Engfeldt M; Bruze M Contact Dermatitis; 2016 Jul; 75(1):59-61. PubMed ID: 27264294 [No Abstract] [Full Text] [Related]