Supplementary materials to: Aetiological understanding of fibromyalgia, irritable bowel syndrome, chronic fatigue syndrome and classificatory analogues: A systematic umbrella review

Supplementary materials to: Kleinstäuber, M., Schröder, A., Daehler, S., Pallesen, K. J., Rask, C. U., Sanyer, M., Van den Bergh, O., Weinreich Petersen, M., & Rosmalen, J. G. M. (2023). Aetiological understanding of fibromyalgia, irritable bowel syndrome, chronic fatigue syndrome and classificatory analogues: A systematic umbrella review. Clinical Psychology in Europe, 5(3), Article e11179. https://doi.org/10.32872/cpe.11179 The Supplementary Materials contain the following items: Supplementary Material 1: Results of the search of electronic literature database. Supplementary Material 2: References of included reviews (k = 452). Supplementary Material 3: References of reviews excluded after fulltext review (k = 526). Supplementary Material 4: Characteristics of included systematic reviews without meta-analysis (k = 123) and systematic reviews with meta-analyses (k = 132). Supplementary Material 5: Characteristics of included narrative reviews (k = 197). Supplementary Material 6A: Specific biological factors investigated in diagnosis-specific specificdiagnosis-specificsystematic reviews (FMS, IBS, CFS/ME and SSD) or systematic reviews that investigated at least two of these diagnoses simultaneously (combinations of FSS/SSD). Supplementary Material 6B: Specific psychosocial factors investigated in diagnosis-specific specificdiagnosis-specificsystematic reviews (FMS, IBS, CFS/ME and SSD) or systematic reviews that investigated at least two of these diagnoses simultaneously (combinations of FSS/SSD). Supplementary Material 7: Characteristics of systematic reviews with meta-analysis with an overall rating ‘high’ of confidence in the results of the review according to AMSTAR-2 (k = 25). Supplementary Material 8: PRISMA Checklist. Supplementary Material 9: Study selection process (PRISMA flow chart). Supplementary Material 10: Frequency of systematic reviews per year of publication since 1990, divided into reviews of critically low, low, moderate and high quality, according to the Assessment of Multiple SysTemAtic Reviews (AMSTAR-2). The grey vertical lines indicate the median (Md) publication year within each quality stratum. unknown unknown