Affiliation: | 1. Neurosurgical Department, Hirslanden Klinik, Zurich, Switzerland 2. Neurosurgical Department, University of Geneva, Geneva, Switzerland 5. Klinik Hirslanden, Witellikerstrasse 40, 8032, Zurich, Switzerland 3. Department of Surgery, Frankston Hospital, Frankston, Victoria, Australia 4. Neurosurgical Department, Universit?tsklinikum Essen, Essen, Germany
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