Electrical impedance of the torso is associated with the pressure pain threshold on myofascial trigger points in patients with chronic neck pain: a cross-sectional study - Dibai-Filho, Almir Vieira; Barros, Marília Artese; Oliveira, Alessandra Kelly de; Guirro, Rinaldo Roberto de Jesus (Journal of Back and Musculoskeletal Rehabilitation, 2018)