Matsuki, Y., M. Mizogami, and K. Shigemi. “Successful Treatment of Failed Back Surgery Syndrome With an Ultrasoundguided Sacroiliac Joint Block: A Report of Two Cases”. Anaesthesia, Pain & Intensive Care, Vol. 21, no. 4, Jan. 2019, pp. 479-81, https://mail.apicareonline.com/index.php/APIC/article/view/80.