Arcila Lotero, M. A. ., M. A. . Mejía Aguilar, R. C. . Rivera Díaz, and L. P. . Montoya. “Comparison of Two Interventional Techniques for the Treatment of Chronic Shoulder Pain”. Colombian Journal of Anesthesiology, vol. 46, no. 1, Jan. 2018, pp. 26-31, https://www.revcolanest.com.co/index.php/rca/article/view/334.