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Knecht U, Bolm-Audorff U, Woitowitz HJ.Knecht U, et al. Among authors: woitowitz hj.Br J Ind Med. 1989 Jul;46(7):479-82. doi: 10.1136/oem.46.7.479.Br J Ind Med. 1989.PMID: 2765421Free PMC article.