POS0931 RETENTION RATE AND TREATMENT RESPONSE OF BIOLOGICAL AGENTS IN ADVANCED SPINAL ANKYLOSIS AND BAMBOO SPINE: THE REAL LIFE DATA FROM THE HUR-BIO REGISTRY
POS0931 RETENTION RATE AND TREATMENT RESPONSE OF BIOLOGICAL AGENTS IN ADVANCED SPINAL ANKYLOSIS AND BAMBOO SPINE: THE REAL LIFE DATA FROM THE HUR-BIO REGISTRY