Single or multiple electroacupuncture sessions in nonspecific low back pain: are we low-responders to electroacupuncture? - Carvalho, Ravena C. de; Parisi, Julia Risso; Prado, Wiliam Alves do; Araújo, João Eduardo de; Silva, Andreia Maria Silva Vilela; Silva, Josie Resende Torres da; Silva, Marcelo Lourenço da (Journal of Acupuncture and Meridian Studies, 2018)