7Vender Linde S, Valkenburg HA, Cats A. Evaluation of diagnostic eriteria for ankylosing spodylitis[J]. Arthritis Rheuma, 1984, 27 : 361.
8Calin A, Garrett S, Whitelock H, et al. A new approach to defining functional ability in ankylosing spondylitis: the development of the Bath ankylosing spondylitis functional index[J]. J Rheumatol, 1994, 21:2281-2285.