Roddy, E., Zwierska, I., Hay, E. M., Jowett, S., Lewis, M., Stevenson, K., …Foster, N. E. (2014). Subacromial impingement syndrome and pain: protocol for a randomised controlled trial of exercise and corticosteroid injection. BMC Musculoskeletal Disorders, 15(81), https://doi.org/10.1186/1471-2474-15-81