Analgesic efficacy of cerebral and peripheral electrical stimulation in chronic nonspecific low back pain: A randomized, double-blinc, factorial clinical trial - Hazime, Fuad A.; Freitas, Diego G. de; Monteiro, Renan L.; Maretto, Rafaela L.; Carvalho, Nilza Aparecida de A.; Hasue, Renata Hydee; João, Silvia M. Amado (BMC Musculoskeletal Disorders, 2015)