Analysis of ASAS health index and its influencing factors in ankylosing spondylitis: a prospective study based on the population of Chaoshan region - Li, Aikang; Liang, Rongji; Wu, Liangbin; Cai, Minghua; Chen, Jiayou; Gong, Yao; Zeng, Shaoyin (Frontiers in Medicine, 2025)