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[Correspondence] Graded exercise self-help for chronic fatigue syndrome in GETSET

The CONSORT statement on harms notes that “it is important to report participants who are non-adherent or lost to follow-up because their actions may reflect their inability to tolerate the intervention.”1 It is thus welcome that Lucy Clark and colleagues2 report physiotherapist-rated data on adherence; they considered that only 42% of participants adhered to guided graded exercise self-help (GES) completely or very well. The protocol notes that to “measure departure from intended treatment, participants will be asked at follow-up whether they adhered to the booklet and guidance, and how much PA [physical activity] they undertook in the past week.”3 It would be useful if Clark and colleagues could now also publish such data.