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Sievert H, Reuhl J, Schräder R, Kaltenbach M, Bussmann WD.Sievert H, et al. Among authors: bussmann wd.Dtsch Med Wochenschr. 1989 May 12;114(19):750-2. doi: 10.1055/s-2008-1066667.Dtsch Med Wochenschr. 1989.PMID: 2714202German.