Arakaki, J.S., F. Jennings, G.Q. Estrela, V.d.G. Cruz Martinelli, and J. Natour. “Strengthening Exercises Using Swiss Ball Improve Pain, Health Status, Quality of Life and Muscle Strength in Patients With Fibromyalgia: A Randomized Controlled Trial”. Reumatismo 73, no. 1 (April 19, 2021): 15-23. Accessed September 24, 2021. https://reumatismo.org/index.php/reuma/article/view/1357.