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Kirchner, A.; Stefan, H.; Schmelz, M.; Haslbeck, K. M.; Birklein, F. . (2002). Influence of vagus nerve stimulation on histamine-induced itching. Neurology, 59(1), 108–112. doi:10.1212/wnl.59.1.108 
10.1212/wnl.59.1.108