Fig. 2

Schedule of enrolment, interventions, and assessments, according to SPIRIT guidelines. Note: FODMAPs, fermentable oligo-, di-, and monosaccharides and polyols; FIQ-R, Revised Fibromyalgia Impact Questionnaire; SF-36, Short Form 36; EVA-Pain, visual analog pain scale; EVA-GI, visual analogue scale from a list of common gastrointestinal and extraintestinal symptoms in FM; BPI, brief pain inventory; PSQI, Pittsburg Sleep Quality Index; FSS, Fatigue Severity Survey; hs-CRP, serum C-reactive protein; ESR, eritrocyte sedimentation rate; IL-8, interleukin-8