H. Alzahrani, M. Mackey, E. Stamatakis, M. B. Pinheiro, and D. Shirley, “Accelerometer-based facilitated walking program in addition to usual care for the management of patients with low back pain at medium or high risk of chronicity: a randomised controlled trial protocol”, Int J Clin Trials, vol. 6, no. 1, pp. 23–32, Jan. 2019.