V. Gagliardi, A. Lovato, F. Ceccherelli, and G. Gagliardi, “Ultrasound-guided caudal epidural injection to treat symptoms of lumbar spinal stenosis: a retrospective study”, Eur J Transl Myol, vol. 34, no. 2, May 2024, doi: 10.4081/ejtm.2024.12167.