Linh, Đỗ P. and Tú, N. H. (2021) “Evaluation of ultrasound-assisted thoracic epidural anesthesia in reducing postoperative pain in patients undergoing upper abdominal surgery: A randomized controlled trial”, Journal of Medical Research, 138(2), pp. 140-147. doi: 10.52852/tcncyh.v138i2.88.