Hmamouchi, I., Allali, F., El Handaoui, B., Amine, H., Rostom, S., Abouqal, R. and Hajjaj-Hassouni, N. 2013. The relation between disease activity, vitamin D levels and bone mineral density in men patients with ankylosing spondylitis. Rheumatology Reports. 5, 1 (Feb. 2013), e3. DOI:https://doi.org/10.4081/rr.2013.e3.