We excluded abstracts, non-systematic reviews and other overviews.
Using a random-number generator, a 20%% check verified eligibility of included and excluded abstracts.
Of 344 double-screened included and excluded abstracts, one initially excluded paper was included in the final analysis.
We evaluated the titles and abstracts of all relevant publications, but excluded abstracts, case reports, editorials, and review articles.
We excluded abstracts, editorials, comments, letters, review articles, and studies that enrolled patients with HIV associated or posttransplant lymphoproliferative disorders.
We excluded abstracts, descriptions of planned studies, and subgroup or secondary analyses of previously published randomised controlled trials.
We excluded abstracts of conference presentations because they did not contain sufficient information (but relevant conference abstracts that were subsequently published as full papers were included).
Excluded abstracts consisted of those that did not discuss key concepts related to sleep and FM, or included pediatric patients as all or part of the population.
We excluded abstracts reporting analyses on healthy people, pharmacokinetic and toxicity studies, and preliminary findings reporting the characteristics of the participants without mention of the allocation groups.
Title and abstract screening was performed by CC using EndNote software, with independent double-screening (JB) of a sample of abstracts to assess reliability (5%% of CC excluded abstracts and all CC included abstracts).
