Z. Cosgun, Y. Dagistan, E. Dagistan, M. E. Kalfaoglu, and C. Cicek, “The Relationship between the Severity of Lumbar Spinal Stenosis and Levels of Vitamin D and Parathyroid Hormone”, Nat J Health Sci, vol. 8, no. 3, pp. 102-107, Sep. 2023.