Further to this comment about the scope of the review, I noticed a paragraph in the CBT review referring to a programme of reviews on CFS, which is why the review is important
https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD001027.pub2/full
Why it is important to do this review
The current body of evidence for CBT remains limited to narrative synthesis within generic CFS reviews (NICE 2007; Chambers 2006) or to meta‐analysis of mean effect sizes (Malouff 2008). Furthermore, potential heterogeneity has been largely based on qualitative assessment and the impact of symptom severity and healthcare setting are uncertain moderators of effect (NICE 2007). An in‐depth, up‐to‐date, systematic review of CBT alone and in combination with other treatments for CFS is of key importance to inform treatment decision by patients, clinicians and policy‐makers. This review is central in a programme of Cochrane reviews for CFS, which also cover exercise therapy (Edmonds 2004), pharmacological treatments (Rawson 2007) and complementary approaches, including acupuncture (Zhang 2006) and traditional Chinese herbal medicine (Adams 2007).
Two reviews mentioned in this programme have disappeared. The review of pharmacological treatments Rawson 2007 [Rawson KM, Rickards H, Haque S, Ward C. Pharmacological treatments for chronic fatigue syndrome. Cochrane Database of Systematic Reviews 2007, Issue 4. [DOI: 10.1002/14651858.CD006813] and acupuncture Zhang 2007 [Zhang W, Liu ZS, Wu Taixiang, Peng WN. Acupuncture for chronic fatigue syndrome. Cochrane Database of Systematic Reviews 2006, Issue Issue 2. [DOI: 10.1002/14651858.CD006010] despite them having a full reference in the review. How can two documents with a DOI disappear without trace? Presumably these were protocols that never progressed to reviews? I might try and contact the authors to find out what happened.
The bringing together of trials of all pharmacological treatments in particular would have been (and still would be) very useful to enable comparison between alternative hypotheses about what may cause and perpetuate the condition, and what may or may not help patients. I will comment on the review and ask them to correct the text referring to reviews that never existed.