Orchard, T., Thiyagaraja, S., Welsh, K., Wordsworth, B., & Jewell, D. (1997). Ankylosing spondylitis (AS) in inflammatory bowel disease (IBD) is associated with possession of HLA-B27 and DR1.

Orchard, T., S. Thiyagaraja, K. Welsh, B. Wordsworth, and D. Jewell. Ankylosing Spondylitis (AS) in Inflammatory Bowel Disease (IBD) Is Associated with Possession of HLA-B27 and DR1. 1997.

Orchard, T., et al. Ankylosing Spondylitis (AS) in Inflammatory Bowel Disease (IBD) Is Associated with Possession of HLA-B27 and DR1. 1997.