Brophy, S., Cooksey, R., Davies, H., Dennis, M., Zhou, S., & Siebert, S. (2013). The effect of physical activity and motivation on function in ankylosing spondylitis: A cohort study. Seminars in Arthritis and Rheumatism, 42(6), pp. -626. doi:10.1016/j.semarthrit.2012.09.007

Brophy, Sinead, Roxanne Cooksey, Helen Davies, Michael Dennis, Shang-ming Zhou, and Stefan Siebert. "The Effect of Physical Activity and Motivation On Function in Ankylosing Spondylitis: A Cohort Study." Seminars in Arthritis and Rheumatism 42, no. 6 (2013): -626.

Brophy, Sinead, et al. "The Effect of Physical Activity and Motivation On Function in Ankylosing Spondylitis: A Cohort Study." Seminars in Arthritis and Rheumatism 42.6 (2013): -626.