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We thank Dr Darsaut et al1 for their attention paid to the PHASES score and for sharing their thinking in an opinion paper 2 years after the publication of our article.2 The authors discuss whether or not prediction modeling based on data from previous observational studies is science. Their final conclusion is that the only valid way to decide whether or not unruptured aneurysms should be treated is to compare outcomes in patients eligible for both options (ie, aneurysm occlusion …
Competing interests None declared.
Provenance and peer review Not commissioned; internally peer reviewed.