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To consider the relevance of the duration of a clinical trial in ankylosing spondylitis: long-term (i.e. 1 yr) vs short-term (i.e. 6 weeks) assessment of a non-steroidal anti-inflammatory drug (NSAID)-placebo controlled study.

Ankylosing spondylitis: what is the optimum duration of a clinical study? A one year versus a 6 weeks non-steroidal anti-inflammatory drug trial