TY - JOUR T1 - Editors’ Commentary: <em>The Effect of Vitamin D Deficiency on Outcomes of Patients Undergoing Elective Spinal Fusion Surgery: A Systematic Review and Meta-Analysis</em> by Khalooeifard et al JF - International Journal of Spine Surgery JO - Int J Spine Surg SP - 2 LP - 3 DO - 10.14444/8170 VL - 16 IS - 1 AU - Kai-Uwe Lewandrowski AU - Morgan P. Lorio Y1 - 2022/02/01 UR - http://ijssurgery.com//content/16/1/2.abstract N2 - ER -