... Ankylosing Spondylitis Disease Activity Index; BASFI, Bath Ankylosing Spondylitis Function Index; BASMI, Bath Ankylosing Spondylitis Metrology Index; CRP, C-reactive protein; ESR, erythrocyte ... and investigation of the patients,study coordination. MR: Monitoring and investigation of thepatients, study coordination. JS: Investigator, writing of themanuscript. JB: Idea, writing of the ... S, Jenkinson T, Kennedy LG, Whitelock H, Gaisford P,Calin A: A new approach to defining disease status in ankylos-ing spondylitis: the Bath Ankylosing Spondylitis Disease Activ-ity Index....