Cosgun, Zeliha, Yasar Dagistan, Emine Dagistan, Melike Elif Kalfaoglu, and Caner Cicek. “The Relationship Between the Severity of Lumbar Spinal Stenosis and Levels of Vitamin D and Parathyroid Hormone”. National Journal of Health Sciences 8, no. 3 (September 22, 2023): 102-107. Accessed May 20, 2024. https://ojs.njhsciences.com/index.php/njhs/article/view/449.