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Strumpf M, Köhler A, Zenz M, Willweber-Strumpf A, Dertwinkel R, Donner B.Strumpf M, et al. Among authors: dertwinkel r.Schmerz. 1997 Aug 25;11(4):233-240. doi: 10.1007/s004820050091.Schmerz. 1997.PMID: 12799808German.