Schäffer Castro, M., J. Pereira Fortes, L. Fernandes Medeiros, and A. de Souza. “Neuromodulatory Effects of Transcranial Pulsed Current Stimulation (tPCS) in Fibromyalgia: Protocol for a Double-Blinded, Sham-Controlled, Randomized Clinical Trial”. Principles and Practice of Clinical Research, vol. 7, no. 3, Oct. 2021, pp. 29-34, doi:10.21801/ppcrj.2021.73.4.