RT Journal Article SR Electronic T1 Overview of the Role of Statistic Analysis in the Design of Spine-related Studies JF International Journal of Spine Surgery JO Int J Spine Surg FD International Society for the Advancement of Spine Surgery SP 26 OP 29 DO 10.1016/SASJ-2009-Comment1 VO 3 IS 1 A1 Donna D. Ohnmeiss YR 2009 UL http://ijssurgery.com//content/3/1/26.abstract AB