Zhu, Chang-e, Bo Yu, Wen Zhang, Wen-hua Chen, Qi Qi, and Yun Miao. 2016. “Effiectiveness and Safety of Transcranial Direct Current Stimulation in Fibromyalgia: A Systematic Review and Meta-Analysis”. Journal of Rehabilitation Medicine 49 (1):2-9. https://doi.org/10.2340/16501977-2179.