Given a passage with a question and an answer to that question, classify if the answer actually answers the question into 'yes' or 'no'. Output 'yes' if the answer answers the question and output 'no' if the answer does not answer the question.

Question: Does outcome trials of COX-2 selective inhibitors : global safety evaluation promise benefits?
Answer: The association of the reduced gastroerosive potential of coxibs with improved meaningful outcomes is debatable. Bias in the design of the trials, selection of outcome measures, post-hoc changes in analysis and the variables used, as well as flaws in the publication and reporting of trial results cast serious doubts on the gastrointestinal and global safety profile of coxibs. In addition, their high cost and the lack of clear identification of patients that would benefit most from treatment means the effectiveness of these drugs is uncertain at the moment.
no