Does body mass index influence intraoperative costs and operative times for open transforaminal lumbar interbody fusion? A time-driven activity-based costing analysis by Danyal A. Quraishi, BS, Advith Sarikonda, BA, BS, D. Mitchell Self, MD, Emily L. Isch, MD, Steven Glener, MD, Arbaz Momin, MD, Ashmal Sami, MD, Nicholas Clark, MD, Joshua Heller, MD, MBA, Srinivas K. Prasad, MD, Ashwini Sharan, MD, Jack Jallo, MD, PhD, James Harrop, MD, Alexander R. Vaccaro, MD, PhD, MBA, Ahilan Sivaganesan, MD

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