P. Pangthipampai, S. Thamtorawat, and A. Tang-bunnon, “Ultrasound-Guided Thoracic Paravertebral Block for Controlling Pain in Percutaneous Radiofrequency Ablation of Hepatic Tumors: A Prospective Case Series”, Siriraj Med J, vol. 70, no. 2, pp. 145–151, Jun. 2018.