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Perrotta A, Serrao M, Tassorelli C, Arce-Leal N, Guaschino E, Sances G, Rossi P, Bartolo M, Pierelli F, Sandrini G, Nappi G.Perrotta A, et al. Among authors: rossi p.Eur J Pain. 2011 May;15(5):482-90. doi: 10.1016/j.ejpain.2010.09.010. Epub 2010 Oct 20.Eur J Pain. 2011.PMID: 20965755Clinical Trial.