PTGS2 and diabetic foot: Retraction: X. Chen, Y. Xu, X. Meng, R. Geng, X. Wang, G. Zhang, and L. Bai, "Analysis of the Association Between Serum Levels of 25(OH)D, Retinol Binding Protein, and Cyclooxygenase-2 and the Disease Severity in Patients with Diabetic Foot Ulcers," International Wound Journal 21, no. 3 (2023): e14502, https://doi.org/10.1111/iwj.14502.