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Vapalahti, M. Proceedings of the 40th Annual Meeting of the Nordisk Neurokirurgisk Forening (Scandinavian Neurosurgical Society), June 15–18, 1988, Kuopio, Finland. Acta neurochir 98, 201–211 (1989). https://doi.org/10.1007/BF01407348
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DOI: https://doi.org/10.1007/BF01407348