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Sure U, Butz N, Siegel AM, Mennel HD, Bien S, Bertalanffy H.Sure U, et al. Among authors: mennel hd.Clin Neurol Neurosurg. 2001 Apr;103(1):29-32. doi: 10.1016/s0303-8467(01)00112-3.Clin Neurol Neurosurg. 2001.PMID: 11311473