Geographic variations in clinical presentation and outcomes of decompressive surgery in patients with symptomatic degenerative cervical myelopathy: analysis of a prospective, international multicenter cohort study of 757 patients - Fehlings, Michael G.; Kopjar, Branko; Ibrahim, Ahmed; Tetreault, Lindsay A.; Arnold, Paul M.; Defino, Helton Luiz Aparecido; Kale, Shashank Sharad; Yoon, S. Tim; Barbagallo, Giuseppe M.; Bartels, Ronald H. M.; Zhou, Qiang; Vaccaro, Alexander R.; et al. (The Spine Journal, 2018)