van der Werff R, O’Leary S, Jull G, Peolsson M, Trygg J, Peolsson A. A speckle tracking application of ultrasound to evaluate activity of multilayered cervical muscles. JRM [Internet]. 2014 Jun. 2 [cited 2024 Nov. 28];46(7):662-7. Available from: https://medicaljournalssweden.se/jrm/article/view/15717