Affiliation: | 1. Faculty of Medicine, Department of Neurosurgery, Marmara University, Marmara üniversitesi T?p Fakültesi, Selimiye M. T?bbiye C. No:38, 34668, Haydarpa?a, Istanbul, Turkey 2. Department of Orthopaedic Surgery, University of California, 521 Parnassus Ave., San Francisco, CA, 94117, USA
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