Zhou, S., Brophy, S., Cooksey, R., Davies, H., Dennis, M. 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. 619-626. doi:10.1016/j.semarthrit.2012.09.007

Zhou, Shang-ming, Sinead Brophy, Roxanne Cooksey, Helen Davies, Michael S. Dennis, 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): 619-626.

Zhou, Shang-ming, 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): 619-626.