Clinical Orthopaedics and Related Research · 2009 · 301 citations · 14 references
Level IV, therapeutic study. See Guidelines for Authors for a complete description of levels of evidence.
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Free Hand Pedicle Screw Placement in the Thoracic Spine: Is it Safe?
Yongjung J. Kim, Lawrence G. Lenke, Keith H. Bridwell et al. · Spine · 2004 · 697 citations