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Slmonetti, V., Manzini, B. M., & Seidenari, S. (1998). Patch testing with nickel sulfate: comparison between 2 nickel sulfate preparations and 2 different test sites on the back. Contact Dermatitis, 39(4), 187–191. doi:10.1111/j.1600-0536.1998.tb05891.x 
10.1111/j.1600-0536.1998.tb05891.x