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. 2022 Mar 1;31(8):2519–2534. doi: 10.1007/s11136-022-03106-1

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© The Author(s) 2022, corrected publication 2023

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Fig. 4 — Comparison of pre-, post- and follow-up treatment assessment of the FIQ-R sub-scales for the different tDCS stimulation groups (M1, DLPFC, OIC and Sham). Lower scores represent improvement (i. e., decrease in symptom severity, impact, or functioning) in FM patients