“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, https://doi.org/10.21801/ppcrj.2021.73.4.