Additional file 1: of The Strengthening Exercises in Shoulder Impingement trial (The SExSI-trial) investigating the effectiveness of a simple add-on shoulder strengthening exercise programme in patients with long-lasting subacromial impingement syndrome: Study protocol for a pragmatic, assessor blinded, parallel-group, randomised, controlled trial
Clausen, M. B., Bandholm, T., Rathleff, M. S., Christensen, K. B., Zebis, M. K., Graven-Nielsen, T., Hölmich, P. & Thorborg, K., 2 mar. 2018, I: Trials.19, 1, s. 15417 s., 154.