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To the Editor: Ryan et al1 present the results of SAFE PACE-2, which are at odds with SAFE PACE-1.2 The authors discuss that this may be due to greater frailty in SAFE PACE-2 participants. This point is valid and merits further reflection in relation to recent frailty literature.
Frailty is a well-recognised clinical syndrome, it but remains difficult to define and measure. Central to the concept of frailty is …
Competing interests None declared.
Provenance and peer review Not commissioned; not externally peer reviewed.
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